Health Information Library

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Diseases



ACL injury
Learn about this injury that affects one of the ma...
ARDS
Acute respiratory distress syndrome (ARDS) is sudd...
Abdominal aortic aneurysm
An aneurysm in the lower part of the aorta can gro...
Absence seizure
This type of seizure produces symptoms such as a v...
Acanthosis nigricans
Learn about the causes of and treatment for this c...
Achalasia
In achalasia, the muscles in your throat don't rel...
Achilles tendinitis
Achilles tendinitis β€” Comprehensive overview cov...
Achilles tendon rupture
An Achilles tendon rupture is an injury that is us...
Acne
Learn more about this common skin condition, inclu...
Acoustic neuroma
This noncancerous tumor can sometimes grow on the ...
Acromegaly
An excess of growth hormone causes the bones to ke...
Actinic keratosis
Find out more about this skin condition that cause...
Acute coronary syndrome
Know the symptoms, causes and treatment of this he...
Acute flaccid myelitis (AFM)
Know the possible symptoms of acute flaccid myelit...
Acute kidney failure
Learn what happens when the kidneys suddenly stop ...
Acute liver failure
A rapid loss of liver function can occur in people...
Acute lymphocytic leukemia
Learn about this cancer that forms in the blood an...
Acute myelogenous leukemia
Learn about this cancer that forms in the bone and...
Acute sinusitis
Learn the latest ways to treat and prevent the stu...
Addison's disease
Learn about this rare but serious disorder of the ...
Adenomyosis
Displaced endometrial tissue from adenomyosis can ...
Adjustment disorders
These are unhealthy reactions to stress that invol...
Adrenal cancer
Learn about this rare cancer that begins in the ad...
Adrenoleukodystrophy
Find out about diagnosis and treatment of adrenole...
Adult Still disease
Learn about symptoms, complications and treatment ...
Adult attention-deficit/hyperactivity disorder (ADHD)
This mental health disorder includes a combination...
Age spots (liver spots)
Learn more about the harmless dark spots on your s...
Agoraphobia
Agoraphobia is an anxiety disorder in which you fe...
Airplane ear
That fullness in your ear when on an airplane that...
Albinism
In this group of inherited disorders, the body mak...
Alcohol intolerance
Having an immediate reaction after drinking alcoho...
Alcohol poisoning
This condition is due to drinking large amounts of...
Alcohol use disorder
Unhealthy alcohol use ranges from mild to severe, ...
Alcoholic hepatitis
Drinking heavily over years can cause inflammation...
Allergies
Allergy symptoms can range from mild to severe, ev...
Alpha-gal syndrome
An allergic reaction to meat-based meals had resea...
Alzheimer's disease
Understand more about this brain disorder that's t...
Ambiguous genitalia
Learn about causes and treatment of ambiguous geni...
Ameloblastoma
Learn more about the symptoms and treatment of thi...
Amenorrhea
Absence of menstruation (amenorrhea) may be linked...
Amnesia
Read about what can cause memory loss and learn st...
Ampullary cancer
Learn more about treatments for cancer of the ampu...
Amyloidosis
This rare disease can affect different organs in d...
Amyotrophic lateral sclerosis (ALS)
This progressive nervous system disease, also know...
Anal cancer
Learn about this cancer that affects the anal cana...
Anal fissure
Learn what causes a tear in the anus and how to pr...
Anal itching
Learn about the causes, treatment and self-care ti...
Anaphylaxis
Anaphylaxis, a severe allergic reaction, is an eme...
Anemia
Having too few healthy red blood cells causes tire...
Angelman syndrome
Learn about this genetic disorder that causes deve...
Angina
Learn about a type of chest pain caused by reduced...
Angiosarcoma
Learn about this rare cancer that begins in the bl...
Ankylosing spondylitis
Learn about this inflammatory disease that can cau...
Anorexia nervosa
Anorexia is an eating disorder characterized by an...
Anorgasmia in women
Anorgasmia is regular difficulty having an orgasm ...
Anterior vaginal prolapse (cystocele)
Anterior prolapse happens when the pelvic floor mu...
Anthrax
Learn about the symptoms and risks of anthrax, a r...
Antibiotic-associated diarrhea
Learn more about why you might get diarrhea while ...
Antiphospholipid syndrome
Learn about causes and treatment of this blood dis...
Antisocial personality disorder
This includes ignoring right and wrong, lying, tre...
Anxiety disorders
Learn the symptoms of this mental health condition...
Aortic dissection
This life-threatening condition occurs when blood ...
Aortic valve disease
Learn more about diseases that affect the valve be...
Aortic valve regurgitation
Learn more about the symptoms and treatment of thi...
Aortic valve stenosis
Learn more about the symptoms and treatment of thi...
Aphasia
Some conditions, including stroke or head injury, ...
Aplastic anemia
Your body stops producing enough new blood cells i...
Appendicitis
Is it just a bellyache or something more serious? ...
Arteriosclerosis / atherosclerosis
Learn about the symptoms, causes and treatments fo...
Arteriovenous fistula
Irregular connections between arteries and veins m...
Arteriovenous malformation
In this condition, a tangle of blood vessels affec...
Arthritis
Learn about how different types of arthritis affec...
Asbestosis
Exposure to asbestos fibers causes this chronic lu...
Ascariasis
Learn more about the causes, treatment and prevent...
Aspergillosis
This fungal lung infection is caused by inhaling c...
Asthma
Find out what can trigger asthma and how to reliev...
Asthma attack
Learn how to recognize when you need to step up tr...
Astigmatism
Imperfect curvature of your eye can cause blurred ...
Astrocytoma
Learn about this type of cancer that can occur in ...
Ataxia
Often caused by an underlying condition, ataxia af...
Atelectasis
Atelectasis is a partly or completely collapsed lu...
Athlete's foot
Learn about the causes, symptoms, prevention and t...
Atopic dermatitis (eczema)
Learn about the causes, symptoms and treatments of...
Atrial fibrillation
A fast, pounding heartbeat could be due to AFib, a...
Atrial septal defect (ASD)
This opening between the heart's upper chambers is...
Atrial tachycardia
This type of fast heartbeat may occur after heart ...
Atrioventricular canal defect
This congenital heart defect involves a hole in th...
Atrioventricular nodal reentry tachycardia (AVNRT)
This most common type of supraventricular tachycar...
Attention-deficit/hyperactivity disorder (ADHD) in children
This condition affects children, and may continue ...
Atypical hyperplasia of the breast
Learn how a diagnosis of atypical lobular hyperpla...
Autism spectrum disorder
Autism spectrum disorder is a serious condition re...
Autoimmune hepatitis
This type of hepatitis occurs when your immune sys...
Autoimmune pancreatitis
Autoimmune pancreatitis is a relatively uncommon d...
Autonomic neuropathy
Damage to the nerves that control involuntary body...
Avascular necrosis (osteonecrosis)
A broken bone or dislocated joint can block blood ...
Baby acne
Baby acne β€” Comprehensive overview covers causes...
Back pain
Back pain is one of the most common reasons people...
Bacterial vaginosis
Learn about symptoms, treatments and prevention of...
Bad breath
Bad breath β€” Comprehensive overview covers cause...
Bags under eyes
Learn about causes, treatments and home remedies β...
Baker cyst
This fluid-filled cyst occurs behind the knee and ...
Balance problems
Learn about the causes and treatments of condition...
Barrett's esophagus
Barrett's esophagus, which is linked to chronic he...
Bartholin's cyst
A Bartholin's cyst is a fluid-filled lump near the...
Basal cell carcinoma
Learn about symptoms, treatment and prevention of ...
Bed-wetting
Learn about causes and treatments of bed-wetting, ...
Bedbugs
Learn more about the symptoms, treatment, preventi...
Bedsores (pressure ulcers)
Learn about the symptoms, treatment and prevention...
Bee sting
Learn more about symptoms, treatment, self-care ti...
Behcet's disease
This rare disorder causes blood vessel inflammatio...
Bell's palsy
Learn more about Bell's palsy, which causes tempor...
Benign paroxysmal positional vertigo (BPPV)
Learn more about the symptoms, causes and treatmen...
Benign peripheral nerve tumor
Learn more about the different types of tumors tha...
Benign prostatic hyperplasia (BPH)
This common problem, also known as an enlarged pro...
Bicuspid aortic valve
This condition, present at birth, affects the valv...
Bile reflux
This digestive problem tends to develop in people ...
Binge-eating disorder
People with binge-eating disorder frequently consu...
Bipolar disorder
Bipolar disorder causes extreme mood swings that i...
Black hairy tongue
Black hairy tongue is a temporary, harmless oral c...
Bladder cancer
Blood in the urine (hematuria) sometimes is a sign...
Bladder exstrophy
This rare birth defect occurs when the bladder dev...
Bladder stones
Minerals in your urine can crystallize if you have...
Blastocystis hominis
This microscopic organism is a parasite that can l...
Blepharitis
This often chronic eyelid condition can be difficu...
Blocked tear duct
Watery, irritated eyes may occur when your tears c...
Blood in urine (hematuria)
Lots of things can cause bloody urine. Some are se...
Body dysmorphic disorder
This mental disorder causes persistent, intense fo...
Body lice
Body lice are tiny insects that live in your cloth...
Boils and carbuncles
Learn about symptoms, causes, treatment and preven...
Bone cancer
Bone cancer most commonly affects the long bones i...
Bone metastasis
Learn about the symptoms and causes of cancer that...
Bone spurs
Joint damage due to osteoarthritis is the most com...
Borderline personality disorder
This mental health disorder includes a pattern of ...
Botulism
This rare but serious condition can be caused by b...
Brachial plexus injury
Learn about these nerve injuries that usually resu...
Bradycardia
Find out more about the symptoms, diagnosis and tr...
Brain AVM (arteriovenous malformation)
Tangled blood vessels in the brain interfere in th...
Brain aneurysm
Learn about the symptoms that may occur when a thi...
Brain metastases
Learn about symptoms, diagnosis and treatment of c...
Brain tumor
Find out more about the different types, signs, sy...
Breast cancer
Learn about this common cancer, including informat...
Breast cysts
A firm, round lump in breast tissue could be a flu...
Breast pain
Learn about possible causes and treatments for bre...
Broken ankle
A simple misstep or twisting injury can cause bone...
Broken arm
Treatment depends on the site and severity of the ...
Broken collarbone
This common injury is usually the result of fallin...
Broken foot
A severely broken foot may require surgery to impl...
Broken hand
You may be at higher risk of a broken hand if you ...
Broken heart syndrome
Learn more about this temporary heart muscle condi...
Broken leg
Treatment of a broken leg depends on the location ...
Broken nose
A broken nose can cause pain, swelling and bruisin...
Broken ribs
This common injury happens most often because of f...
Broken toe
Pain when wearing shoes and difficulty walking can...
Broken wrist
The most common type of wrist fracture occurs when...
Bronchiolitis
Infection in the small airways of the lungs is com...
Bronchitis
Bronchitis is an inflammation of the tubes that ca...
Brucellosis
Brucellosis is an infectious bacterial disease oft...
Brugada syndrome
Learn about the symptoms, causes and treatments fo...
Bruxism (teeth grinding)
Bruxism is a condition in which you grind, gnash o...
Buerger disease
Read about this blood vessel disease that limits b...
Bulimia nervosa
With bulimia, a serious eating disorder, you eat l...
Bullous pemphigoid
Learn about the symptoms, treatment and self-care ...
Bundle branch block
A delay or blockage in the heart's signaling pathw...
Bunions
A bunion is a bony bump that forms on the joint at...
Burning mouth syndrome
This burning sensation, without an obvious cause, ...
Burns
Understand how to prevent, treat and recover from ...
Bursitis
Bursitis is the painful inflammation of small, flu...
C. difficile infection
Learn more about this diarrhea-causing infection t...
COPD
This chronic inflammatory lung disease causes obst...
CSF leak (Cerebrospinal fluid leak)
Cerebrospinal fluid leaks may originate from the b...
Calciphylaxis
Learn more about this uncommon condition that affe...
Cancer
Find out the basics about cancer, including sympto...
Canker sore
Canker sore β€” Learn about the causes, treatment ...
Carbon monoxide poisoning
This gas has no color, odor or taste. It can be de...
Carcinoid syndrome
Find out about skin flushing and other symptoms of...
Carcinoid tumors
Learn about these slow-growing cancers that usuall...
Carcinoma of unknown primary
In this uncommon and aggressive type of cancer, do...
Cardiogenic shock
Most often the result of a severe heart attack, th...
Cardiomyopathy
This disease of the heart muscle makes it harder f...
Carotid artery disease
Learn about this condition that can lead to a stro...
Carpal tunnel syndrome
Learn more about the symptoms, diagnosis and treat...
Cataracts
Are things starting to look fuzzy or blurry? Find ...
Cavernous malformations
Understand the signs and symptoms that may occur w...
Cavities/tooth decay
Cavities, also called tooth decay, are permanently...
Celiac disease
In this digestive condition, gluten in food damage...
Cellulite
Learn more about this common skin condition that c...
Cellulitis
Find out more about this potentially serious skin ...
Central nervous system vascular malformations
Several types of this condition affect the blood v...
Central sleep apnea
Find out how a mix-up in brain signals can affect ...
Cerebral palsy
Damage to the developing brain, usually before bir...
Cervical cancer
Screening with Pap tests can reduce the risk of th...
Cervical dystonia
This rare movement disorder causes neck muscles to...
Cervical spondylosis
As people age, the spinal disks in the neck shrink...
Cervicitis
Sexually transmitted infections are often the reas...
Chagas disease
Learn more about this inflammatory, infectious dis...
Charcot-Marie-Tooth disease
Learn how to spot the symptoms and how doctors tre...
Chemo brain
Learn about the memory and thinking changes that s...
Chest pain
Pain in the chest has many possible causes β€” and...
Chiari malformation
Find out about the symptoms, causes, and treatment...
Chickenpox
Learn more about preventing this once-common child...
Chilblains
Learn how to prevent and treat this seasonal skin ...
Child abuse
Child abuse includes physical, sexual, emotional a...
Childhood apraxia of speech
This speech disorder is caused by a problem with c...
Childhood asthma
The lungs and airways of children with asthma beco...
Childhood obesity
Childhood obesity can lead to various conditions, ...
Childhood schizophrenia
This severe mental disorder in children involves h...
Chlamydia trachomatis
This common sexually transmitted infection (STI) c...
Cholangiocarcinoma (bile duct cancer)
Learn about symptoms, risk factors, diagnosis and ...
Cholecystitis
Learn the causes, symptoms, complications and trea...
Cholera
Cholera is a treatable β€” yet potentially fatal β...
Cholestasis of pregnancy
This liver condition can occur late in pregnancy, ...
Chondrosarcoma
Learn about this rare type of cancer that primaril...
Chordoma
Find out about this rare type of bone cancer. Lear...
Choroid plexus carcinoma
This rare type of cancerous brain tumor occurs mai...
Chronic cough
A cough that lasts for weeks could be caused by sm...
Chronic daily headaches
If you have a headache most days, you might have o...
Chronic exertional compartment syndrome
Learn about this condition that causes pain and sw...
Chronic granulomatous disease
Learn about this inherited disease, usually diagno...
Chronic hives
Learn how this long-lasting skin condition that ca...
Chronic kidney disease
Learn about kidney failure symptoms, tests, diagno...
Chronic lymphocytic leukemia
Learn about this cancer that forms in white blood ...
Chronic myelogenous leukemia
Learn about chronic myelogenous leukemia symptoms ...
Chronic pelvic pain
Ongoing pain in the pelvis can be a symptom of ano...
Chronic sinusitis
Read about possible causes of lasting sinus troubl...
Chronic traumatic encephalopathy
This type of brain degeneration is likely caused b...
Churg-Strauss syndrome
This rare blood vessel disease may cause breathing...
Cirrhosis
This advanced stage of liver damage often shows no...
Claudication
Too little blood flow to the legs and arms can cau...
Cleft lip and cleft palate
Surgery can fix openings or splits in the upper li...
Clubfoot
This term describes a range of congenital foot abn...
Cluster headache
These painful headaches cause severe pain on one s...
Coarctation of the aorta
Learn more about the causes and treatment of this ...
Cold sore
Learn more about the causes, symptoms, treatment ...
Cold urticaria
Learn more about the symptoms and treatment of thi...
Colic
Consoling a baby who cries a lot for no apparent r...
Colon cancer
Find out about symptoms and causes for this cancer...
Colon polyps
Have you had your colonoscopy? Colon polyps typica...
Color blindness
Is it red or is it green? Learn more about what ca...
Coma
Learn what can cause this state of prolonged loss ...
Common cold
This common illness of the nose and throat causes ...
Common cold in babies
This viral infection causes a runny nose and nasal...
Common warts
Find out tips for preventing and dealing with this...
Complex regional pain syndrome
Learn about this neurological condition that may a...
Complicated grief
In complicated grief, painful emotions of loss don...
Compulsive gambling
Also called gambling disorder, compulsive gambling...
Compulsive sexual behavior
Also called sexual addiction, this means being obs...
Concussion
This brain injury causes symptoms such as headache...
Congenital adrenal hyperplasia
Congenital adrenal hyperplasia (CAH) is a group of...
Congenital diaphragmatic hernia (CDH)
In CDH, a baby's diaphragm β€” the muscle that sep...
Congenital heart defects in children
Learn about symptoms, tests and treatments for chi...
Congenital heart disease in adults
A heart problem present at birth may not cause sym...
Congenital mitral valve anomalies
These heart problems at birth cause the mitral val...
Conjoined twins
If an early embryo only partially separates and tw...
Constipation
Learn how to prevent and treat infrequent or painf...
Constipation in children
Learn what could cause constipation in your child,...
Contact dermatitis
Contact with certain substances, such as poison iv...
Corns and calluses
Find out more about these hardened areas of skin t...
Coronary artery disease
Know the warning signs of this common heart condit...
Coronavirus disease 2019 (COVID-19)
Find out about coronavirus disease 2019 (COVID-19)...
Corticobasal degeneration (corticobasal syndrome)
Learn about this rare condition that affects your ...
Costochondritis
This chest wall pain, caused by inflammation, usua...
Cough headaches
Often triggered by coughing and other types of str...
Cradle cap
Learn about the symptoms, treatments and home care...
Craniopharyngioma
Learn more about this noncancerous tumor that form...
Craniosynostosis
This condition results in premature fusing of one ...
Creutzfeldt-Jakob disease
Learn what can put someone at risk of developing t...
Crohn's disease
Learn about symptoms and treatment for this debili...
Croup
This upper airway infection makes it harder to bre...
Cryoglobulinemia
When abnormal proteins in your blood clump togethe...
Cushing syndrome
High levels of the hormone cortisol in your body c...
Cutaneous B-cell lymphoma
Learn about this type of cancer that starts in the...
Cutaneous T-cell lymphoma
Learn about this type of non-Hodgkin's lymphoma th...
Cyclic vomiting syndrome
Cyclic vomiting syndrome often starts in childhood...
Cyclothymia (cyclothymic disorder)
Also called cyclothymic disorder, this mood disord...
Cystic fibrosis
This inherited condition causes severe damage to t...
Cystitis
Cystitis is a condition that affects the bladder. ...
Cytomegalovirus (CMV) infection
Understand the symptoms and treatment of this comm...
Dandruff
Learn about the causes of this sometimes embarrass...
De Quervain tenosynovitis
This painful condition affects the tendons on the ...
Deep vein thrombosis (DVT)
This potentially serious condition can occur with ...
Dehydration
Dehydration is especially common and dangerous for...
Delayed ejaculation
Learn what could be causing delayed or absent ejac...
Delayed sleep phase
Learn more about this sleep condition that causes ...
Delirium
Learn what may cause this change in mental abiliti...
Dementia
This group of symptoms with many causes affects me...
Dengue fever
Learn how to identify the symptoms of this serious...
Depersonalization-derealization disorder
This mental health condition causes you to feel li...
Depression (major depressive disorder)
Depression is a mood disorder that causes a persis...
Dermatitis
Learn about the symptoms, causes and treatments of...
Dermatofibrosarcoma protuberans
Learn about symptoms and diagnosis for this rare t...
Dermatographia (Dermatographism)
Learn about the symptoms, causes and treatment of ...
Dermatomyositis
Muscle weakness and a skin rash are hallmarks of d...
Desmoid tumors
Learn how doctors use surgery, radiation therapy, ...
Desmoplastic small round cell tumors
These rare, aggressive cancers most often form in ...
Deviated septum
Learn how uneven nostrils can cause congestion, no...
DiGeorge syndrome (22q11.2 deletion syndrome)
DiGeorge syndrome (22q11.2 deletion syndrome) is a...
Diabetes
Learn more about the different types of this blood...
Diabetes insipidus
Learn more about this unusual disorder that disrup...
Diabetic coma
iabetic coma is a life-threatening disorder that c...
Diabetic hypoglycemia
Low blood sugar can make you feel awful and is pot...
Diabetic ketoacidosis
Learn more about the symptoms, treatment and preve...
Diabetic nephropathy (kidney disease)
Diabetic nephropathy is a common complication in p...
Diabetic neuropathy
High blood sugar can lead to nerve damage in feet ...
Diabetic retinopathy
Good diabetes control and regular exams can help p...
Diaper rash
Learn more about the causes, prevention and home r...
Diarrhea
Learn more about what causes this common, unpleasa...
Dilated cardiomyopathy
In this heart muscle disease, the heart's main pum...
Diphtheria
This rare but serious bacterial infection can caus...
Dislocated shoulder
This shoulder injury, which occurs in the body's m...
Dissociative disorders
These mental health conditions involve experiencin...
Diverticulitis
This common colon disease develops when small pouc...
Dizziness
Dizziness has many possible causes. How long it la...
Double uterus
Learn about symptoms, diagnosis and treatment of t...
Double-outlet right ventricle
In this heart condition present at birth, two majo...
Down syndrome
Down syndrome is a genetic disorder caused when ab...
Dressler syndrome
Learn about the symptoms and treatment of inflamma...
Drug addiction (substance use disorder)
Drug addiction affects your brain and behavior to ...
Drug allergy
Learn which drugs are more likely to cause an alle...
Dry eyes
Eyes feeling dry and uncomfortable? Inadequate tea...
Dry macular degeneration
Blurred or reduced central vision could be a sign ...
Dry mouth
Dry mouth (xerostomia) refers to a condition in wh...
Dry skin
Learn more about the causes of and self-care tips ...
Dry socket
This painful condition can happen after tooth remo...
Ductal carcinoma in situ (DCIS)
Noninvasive breast cancer often has no signs or sy...
Dumping syndrome
People who have had stomach or weight-loss surgery...
Dupuytren contracture
This painless condition causes one or more fingers...
Dural arteriovenous fistulas
Treatments for these abnormal connections between ...
Dust mite allergy
Dust mite allergy can lead to year-round sniffles ...
Dwarfism
Very short stature of 4 feet 10 inches or less tha...
Dysarthria
This condition affects muscles used for speaking. ...
Dyshidrosis
Learn about the symptoms, causes and treatment of ...
Dyslexia
This learning disorder involves difficulty reading...
Dysphagia
Learn more about what causes persistent trouble sw...
Dystonia
Find out more about this painful muscle contractio...
E. coli
Most strains of E. coli bacteria are harmless, but...
Ear infection (middle ear)
These usually get better on their own, but sometim...
Earwax blockage
Learn simple steps for treatment and self-care of ...
Eating disorders
Anorexia, bulimia and binge-eating disorder affect...
Ebstein anomaly
In this rare heart defect, the tricuspid heart val...
Ectopic pregnancy
Ectopic pregnancy occurs outside the uterus, threa...
Ectropion
Ectropion is an eye condition in which your eyelid...
Edema
Learn about symptoms, causes and treatment of swel...
Egg allergy
Egg allergy can cause a serious reaction in childr...
Ehlers-Danlos syndrome
Learn about these complex genetic disorders that c...
Ehrlichiosis and anaplasmosis
Learn how to prevent and treat the tick-borne dise...
Eisenmenger syndrome
This complication of an unrepaired congenital hear...
Elevated blood pressure
If your blood pressure is slightly elevated, eatin...
Embryonal tumors
Learn about these malignant brain tumors that happ...
Emphysema
Emphysema is a lung problem that makes it hard to ...
Encephalitis
Learn about this potentially life-threatening cond...
Encopresis
Encopresis, also called fecal incontinence or soil...
End-stage renal disease
When kidneys no longer function well enough to mee...
Endocarditis
Learn what causes this infection of the inner lini...
Endometrial cancer
Learn about the symptoms and causes of this cancer...
Endometriosis
Learn about endometriosis, including possible trea...
Enlarged breasts in men (gynecomastia)
Learn how an imbalance of the hormones estrogen an...
Enlarged heart
Cardiomegaly is another word for this sign or symp...
Enlarged liver
Having a larger than normal liver is a sign of a s...
Enlarged spleen (splenomegaly)
Learn about what your spleen does and what can hap...
Entropion
In entropion, your eyelid turns inward, causing la...
Eosinophilic esophagitis
Learn more about the causes and treatment of eosin...
Ependymoma
Learn about this tumor that forms from ependymal c...
Epidermoid cysts
Find out more about this usually harmless, common ...
Epidermolysis bullosa
Learn about a rare inherited disease that often sh...
Epididymitis
This inflammation of the coiled tube at the back o...
Epiglottitis
A blocked windpipe needs prompt treatment....
Epilepsy
Learn about epilepsy symptoms, possible causes of ...
Epithelioid sarcoma
This rare, slow-growing soft tissue cancer tends t...
Erectile dysfunction
Understand what can cause the inability to get and...
Esophageal cancer
Esophageal cancer β€” Comprehensive overview cover...
Esophageal spasms
This digestive condition is sometimes mistaken for...
Esophageal varices
Learn how to spot and what to do if you experience...
Esophagitis
An inflamed, sore esophagus can make it difficult ...
Essential tremor
Learn about this condition that causes uncontrolla...
Esthesioneuroblastoma
This cancer begins in the upper part of the inside...
Ewing sarcoma
Learn about diagnosis and treatment of this bone a...
Exercise headaches
Learn about the causes and treatments of this puzz...
Exercise-induced asthma
Regular exercise is beneficial in many ways, but f...
Eye floaters
Many people over age 50 experience eye floaters. L...
Eye melanoma
Eye melanoma is a type of eye cancer. Learn about ...
Eyestrain
Gazing for long stretches at computer or digital s...
Factitious disorder
Factitious disorder ― a serious mental disorder ...
Factor V Leiden
This inherited clotting disorder can increase your...
Familial Mediterranean fever
This genetic autoinflammatory disorder causes recu...
Familial adenomatous polyposis
This inherited condition leads to colon cancer. Tr...
Familial hypercholesterolemia
This inherited condition can cause extremely high ...
Farsightedness
Do you see distant objects clearly, but develop a ...
Febrile seizure
These frightening but generally harmless seizures ...
Fecal incontinence
Learn about this common issue that causes some peo...
Female infertility
Learn about infertility in women, including possib...
Female sexual dysfunction
Learn more about female sexual difficulties β€” wh...
Fetal alcohol syndrome
Fetal alcohol syndrome results from alcohol exposu...
Fetal macrosomia
When a baby in utero grows much larger than averag...
Fever
Medications can lower a fever, but sometimes it's ...
Fibroadenoma
Learn about this common breast lump. It is not can...
Fibrocystic breasts
Learn about this condition that's common in women,...
Fibromuscular dysplasia
Learn more about this condition that can narrow di...
Fibromyalgia
This complicated disorder amplifies painful sensat...
Flatfeet
A common and usually painless condition, flatfeet ...
Floor of the mouth cancer
Learn about the symptoms of this type of cancer th...
Folliculitis
Learn more about how damaged hair follicles become...
Food allergy
For people with food allergies, symptoms can range...
Food poisoning
Learn more about foodborne illnesses that can caus...
Foot drop
Foot drop is a general term that describes a diffi...
Frontal lobe seizures
In this common form of epilepsy, the seizures stem...
Frontotemporal dementia
Read more about this less common type of dementia ...
Frostbite
Learn how to prevent cold injury to the skin when ...
Frozen shoulder
This painful condition usually begins gradually an...
Fuchs' dystrophy
Fuchs' dystrophy can cause eye pain and vision pro...
Functional dyspepsia
Learn about functional dyspepsia, a digestive diso...
Functional neurologic disorder/conversion disorder
This disorder includes nervous system symptoms aff...
Galactorrhea
Galactorrhea is a type of milky nipple discharge i...
Gallbladder cancer
Learn about this cancer that begins in the gallbla...
Gallstones
Gallstones are hard pieces of material that can fo...
Ganglion cyst
These fluid-filled, noncancerous lumps most often ...
Gangrene
A severe bacterial infection or lack of blood flow...
Gas and gas pains
Learn about what is normal digestive system gas, w...
Gastritis
Gastritis β€” inflammation of the stomach lining β...
Gastroesophageal reflux disease (GERD)
GERD, in which stomach acid moves into the esophag...
Gastrointestinal bleeding
Bleeding from anywhere in your digestive tract is ...
Gastrointestinal stromal tumor (GIST)
Learn about this type of cancer that usually happe...
Gastroparesis
Learn about symptoms and treatment for gastropares...
Gaucher disease
An enzyme that breaks down certain fatty substance...
Gender dysphoria
Learn about the treatments that can help alleviate...
Generalized anxiety disorder
Excessive, ongoing anxiety and worry can interfere...
Genital herpes
This sexually transmitted infection can't be cured...
Genital warts
The human papillomavirus (HPV) causes the most com...
Geographic tongue
Geographic tongue may look alarming, but it does n...
Gestational diabetes
This high blood sugar disorder develops during pre...
Giant cell arteritis
Head pain and tenderness are the most common sympt...
Giardia infection (giardiasis)
Stomach cramps, nausea and watery diarrhea could i...
Gilbert syndrome
This inherited liver condition affects the liver's...
Gingivitis
Gingivitis is a common and mild form of gum diseas...
Glaucoma
Regular eye exams may catch glaucoma early and sav...
Glioblastoma
This fast-growing cancer starts in the brain or sp...
Glioma
Gliomas are the most common brain tumors in adults...
Glomerulonephritis
Learn about symptoms, causes and treatments for ac...
Goiter
Enlargement of the thyroid gland may be caused by ...
Golfer's elbow
Golfers, tennis players and others who repeatedly ...
Gonorrhea
This common sexually transmitted infection often c...
Gout
This type of arthritis can cause sudden, severe at...
Granuloma annulare
Learn about this painless skin condition mainly af...
Granulomatosis with polyangiitis
Granulomatosis with polyangiitis causes inflammati...
Graves' disease
Learn about the symptoms, causes and treatment of ...
Group B strep disease
This common bacterium, usually harmless in healthy...
Growing pains
Learn about this common condition involving leg pa...
Growth plate fractures
Growth plate fractures β€” This common childhood b...
Guillain-Barre syndrome
This rare autoimmune disorder affects the nerves, ...
H1N1 flu (swine flu)
Find out more about flu caused by the H1N1 virus. ...
HIV/AIDS
Learn more about this potentially life-threatening...
HPV infection
This common viral infection often gets better on i...
Hair loss
This common and sometimes stressful condition may ...
Hairy cell leukemia
This slow-growing cancer doesn't always need immed...
Hammertoe and mallet toe
Low-heeled shoes that leave enough room for the to...
Hamstring injury
Self-care measures, such as rest and ice, might be...
Hand-foot-and-mouth disease
Learn about the symptoms and treatment of this con...
Hangovers
Unpleasant signs and symptoms can develop after dr...
Hantavirus pulmonary syndrome
Learn about the rodent-transmitted virus that caus...
Hashimoto's disease
Learn about the symptoms and treatment of this thy...
Hay fever
Find out more about how to diagnose and get relief...
Head lice
Find out how these tiny insects that feed on blood...
Headaches in children
Find out more about headaches in children, which m...
Hearing loss
Age- and noise-related hearing loss are common and...
Heart arrhythmia
Learn about common heart rhythm disorders that can...
Heart attack
A blockage of blood flow to the heart can damage o...
Heart disease
Learn about symptoms, causes and treatment of card...
Heart failure
Learn about this chronic disease that needs lifelo...
Heart murmurs
An irregular heart sound may be harmless or worris...
Heart palpitations
Know when and how feelings of a rapid, fluttering ...
Heart valve disease
Learn about this condition in which one or more of...
Heartburn
Occasional heartburn is a common, manageable condi...
Heat exhaustion
An overheated body can lead to dangerous symptoms....
Heat rash
Learn more about the symptoms, causes and treatmen...
Heatstroke
Know the signs and what to do for this dangerous i...
Heavy menstrual bleeding
Learn about the causes and treatment of heavy mens...
Helicobacter pylori (H. pylori) infection
Learn more about the symptoms, tests and treatment...
Hemangioma
This red mark on a baby's skin looks like a rubber...
Hemifacial spasm
Learn about diagnosis and treatment of this nervou...
Hemochromatosis
This liver disorder causes your body to absorb too...
Hemolytic uremic syndrome (HUS)
Damage to the small blood vessels in the kidneys c...
Hemophilia
In this inherited disorder, the blood lacks one of...
Hemorrhoids
There are many effective options for easing the di...
Henoch-Schonlein purpura
Learn about the symptoms, causes and treatment of ...
Hepatitis A
This contagious liver infection is caused by a vir...
Hepatitis B
This highly contagious virus can cause long-lastin...
Hepatitis C
Many people with this infection don't know they ha...
Hepatocellular carcinoma
Learn about innovative treatments for the most com...
Hepatopulmonary syndrome
This lung condition causes low oxygen levels and s...
Hereditary hemorrhagic telangiectasia
This inherited blood vessel disorder can cause sev...
Herniated disk
This condition occurs most often in the lower back...
Hiatal hernia
A hiatal hernia occurs when part of the stomach bu...
Hiccups
Caused by spasms of your diaphragm that you can't ...
Hidradenitis suppurativa
This condition causes small, painful lumps to form...
High blood pressure (hypertension)
Learn the symptoms and treatment of this condition...
High blood pressure in children
Children can develop high blood pressure for the s...
High cholesterol
You need some cholesterol in your blood to build h...
Hilar cholangiocarcinoma
Learn about how this type of bile duct cancer is d...
Hip dysplasia
In infancy, this condition often can be corrected ...
Hip fracture
The risk of breaking a hip increases with age. Lea...
Hip labral tear
Sports such as soccer, football and golf can incre...
Hirschsprung's disease
This digestive disorder that's present at birth af...
Hirsutism
Learn more about causes and complications of unwan...
Histoplasmosis
Learn more about the symptoms and treatment of thi...
Hives and angioedema
Learn more about these common but short-lived skin...
Hoarding disorder
This mental health condition involves ongoing diff...
Hodgkin's lymphoma (Hodgkin's disease)
Learn how this cancer differs from other lymphomas...
Horner syndrome
Find out about Horner syndrome, an interruption in...
Hot flashes
Hot flashes are the most common symptom of menopau...
Huntington's disease
This condition causes a progressive breakdown of n...
Hurthle cell cancer
Learn about this rare type of aggressive thyroid c...
Hydrocele
Find out more about the symptoms, causes and treat...
Hydrocephalus
Learn about this potentially fatal condition that ...
Hydronephrosis
Learn about this condition that occurs when urine ...
Hypercalcemia
Hypercalcemia can weaken your bones, create kidney...
Hypereosinophilic syndrome
Hypereosinophilic syndrome is a disorder of certai...
Hyperglycemia in diabetes
Hyperglycemia in diabetes can occur for many reaso...
Hyperhidrosis
Learn more about causes, symptoms, treatment and s...
Hyperoxaluria and oxalosis
Learn about symptoms, causes, diagnosis and treatm...
Hyperparathyroidism
Learn about symptoms, tests and treatment for this...
Hyperthyroidism (overactive thyroid)
Understand what happens when your thyroid is overa...
Hypertrophic cardiomyopathy
In this condition, the heart muscle thickens, whic...
Hypoglycemia
Low blood sugar can cause uncomfortable symptoms, ...
Hyponatremia
Hyponatremia is the term used when your blood sodi...
Hypoparathyroidism
Learn more about this uncommon condition in which ...
Hypopituitarism
Learn about the symptoms and treatment of this rar...
Hypoplastic left heart syndrome
Learn more about this rare congenital heart condit...
Hypospadias
Hypospadias is a birth defect in which the opening...
Hypothermia
Learn about symptoms, treatment and prevention of ...
Hypothyroidism (underactive thyroid)
Understand what happens when your thyroid is under...
Idiopathic hypersomnia
This is a sleep disorder that causes you to be exc...
IgA nephropathy (Berger disease)
This disease causes kidney inflammation that, over...
Illness anxiety disorder
Excessive worry that you're seriously ill based on...
Immune thrombocytopenia (ITP)
Caused by low levels of platelets, symptoms may in...
Impacted wisdom teeth
Impacted wisdom teeth β€” Learn about symptoms, co...
Impetigo
Learn about the symptoms, causes and treatment of ...
Incompetent cervix
Sometimes the cervix opens and thins early, puttin...
Indigestion
Is it indigestion or something else? Find out abou...
Infant jaundice
Learn about this common condition in newborns, esp...
Infant reflux
Learn more about when a baby spits up food or liqu...
Infectious diseases
Viruses, bacteria, fungi and parasites can all cau...
Infertility
Find out about the challenges of not being able to...
Inflammatory bowel disease (IBD)
Chronic diarrhea and belly pain could be caused by...
Inflammatory breast cancer
Learn about this rare, aggressive type of breast c...
Influenza (flu)
Learn more about the symptoms, causes and preventi...
Ingrown hair
Learn about causes, treatment and prevention of th...
Ingrown toenails
Learn about causes, prevention and treatment of th...
Inguinal hernia
What happens if part of the intestine bulges throu...
Insomnia
Insomnia is a disorder that can make it hard to fa...
Intermittent explosive disorder
This mental disorder involves repeated, sudden epi...
Interstitial cystitis
Bladder pain and urinary frequency flare with cert...
Interstitial lung disease
In interstitial lung disease, progressive lung can...
Intestinal ischemia
Learn about what happens when blood flow to part o...
Intestinal obstruction
A blocked intestine needs prompt medical care. Lea...
Intracranial hematoma
This collection of blood within the skull is a ser...
Intracranial venous malformations
Intracranial venous malformations are abnormally e...
Intussusception
This rare but serious disorder occurs when one par...
Invasive lobular carcinoma
Breast cancer that begins in the milk-producing gl...
Iritis
Learn about who's at risk of this eye condition an...
Iron deficiency anemia
Iron deficiency anemia β€” Comprehensive overview ...
Irritable bowel syndrome
Lifestyle changes can make a big difference when i...
Ischemic colitis
Ischemic colitis occurs when a part of the colon e...
Itchy skin (pruritus)
Learn about causes of this common irritating skin ...
Jaw tumors and cysts
Also called odontogenic tumors and cysts, these ty...
Jellyfish stings
Learn more about prevention and first aid for thes...
Jet lag disorder
Jetting across time zones can take a toll on your ...
Jock itch
Learn more about this common, treatable fungal inf...
Juvenile idiopathic arthritis
Learn about this type of arthritis that affects ch...
Kaposi sarcoma
This cancer caused by a virus occurs in people who...
Kawasaki disease
Learn more about this condition that primarily aff...
Keloid scar
Learn about how to prevent, remove or flatten thes...
Keratitis
An inflamed, red eye can be a minor nuisance β€” b...
Keratoconus
When your cornea bulges outward, it can cause blur...
Keratosis pilaris
Find out more about this harmless, nonpitch skin c...
Kidney cancer
Learn about the symptoms and causes of kidney canc...
Kidney cysts
These round, fluid-filled pouches on or in the kid...
Kidney infection
A urinary tract infection that travels to the kidn...
Kidney stones
Learn about the symptoms, risks, causes and treatm...
Kleptomania
If you have this impulse control disorder, you can...
Klinefelter syndrome
This genetic disorder occurs when a male is born w...
Klippel-Trenaunay syndrome
Main signs of this congenital disorder involve a r...
Knee bursitis
Knee bursitis is inflammation of a small fluid-fil...
Knee pain
Learn about this common complaint, which can resul...
Kyphosis
This exaggerated, forward rounding of the back is ...
Lactose intolerance
Not being able to fully digest the sugar (lactose)...
Laryngitis
Learn about the symptoms, causes and treatment for...
Latex allergy
This allergy is a reaction to proteins in natural ...
Lazy eye (amblyopia)
Abnormal visual development early in life can caus...
Lead poisoning
Learn about lead poisoning symptoms and treatment ...
Left ventricular hypertrophy
Learn more about this heart condition that causes ...
Legg-Calve-Perthes disease
This childhood condition occurs when blood supply ...
Legionnaires' disease
Bacteria that can live in water from air condition...
Leiomyosarcoma
Learn about this rare cancer that begins in smooth...
Leukemia
Learn about this cancer that forms in the blood an...
Leukoplakia
Leukoplakia appears as thickened, white patches on...
Lewy body dementia
This common dementia is caused by a buildup of pro...
Lice
Learn how to get rid of these tiny, wingless insec...
Lichen planus
Learn about the causes, symptoms and treatment of ...
Lichen sclerosus
Learn more about the causes, symptoms, complicatio...
Lip cancer
Lip cancer often appears as a sore on your lip tha...
Lipoma
Lipoma β€” Comprehensive overview covers symptoms,...
Liposarcoma
Learn about diagnosis and treatment options for th...
Listeria infection
This foodborne bacterial illness can be very serio...
Liver cancer
Learn how doctors use surgery, liver transplant, r...
Liver disease
The liver has a lot of important functions includi...
Liver hemangioma
A liver hemangioma is a noncancerous mass that typ...
Lobular carcinoma in situ (LCIS)
If a breast biopsy reveals you have LCIS, your ris...
Long QT syndrome
Learn more about the causes and treatment of this ...
Low blood pressure (hypotension)
Low blood pressure isn't always a concern. But som...
Low sex drive in women
Many women experience a low sex drive at some poin...
Low sperm count
Having a low sperm count can make conceiving a chi...
Lung cancer
Learn about the approaches doctors take to treatin...
Lupus
Learn how this disease can affect your joints, ski...
Lupus nephritis
Learn about this common lupus complication affecti...
Lyme disease
Learn about the symptoms, diagnosis and treatment ...
Lymphedema
Damaged or removed lymph nodes can affect how lymp...
Lymphoma
Cancer that forms in the germ-fighting lymphatic s...
Lynch syndrome
Learn about this condition caused by inherited gen...
MCAD deficiency
This inherited genetic disorder prevents the break...
MRSA infection
MRSA infections often occur in health care setting...
Malaria
Learn about the symptoms, causes, treatment, and p...
Male breast cancer
Breast cancer can affect anyone. Learn about the s...
Male hypogonadism
This condition affects the ability of men's bodies...
Male infertility
Male infertility often plays a role when couples h...
Malignant hyperthermia
This rare genetic disorder triggers a severe react...
Malignant peripheral nerve sheath tumors
These cancers form in the linings of nerves. Treat...
Mammary duct ectasia
Mammary duct ectasia is a noncancerous breast cond...
Marfan syndrome
This inherited disorder affects the skeleton and t...
Mastitis
Redness, pain and swelling in your breast could be...
Measles
Learn about this vaccine-preventable disease that ...
Median arcuate ligament syndrome (MALS)
Stomach pain after eating isn't always indigestion...
Medication overuse headaches
When medicines that ease headache pain are used to...
Medulloblastoma
Medulloblastoma is the most common cancerous brain...
Melanoma
Learn about melanoma symptoms, such as suspicious ...
Meniere's disease
This chronic disorder affects balance and hearing,...
Meningioma
Meningioma is the most common type of tumor that f...
Meningitis
Spot the signs and understand the treatment option...
Menopause
Find out about this biological change and its long...
Menstrual cramps
Menstrual cramps β€” pain in the lower abdomen jus...
Mental illness
A wide range of mental health conditions affect mo...
Meralgia paresthetica
Meralgia paresthetica β€” Comprehensive overview c...
Merkel cell carcinoma
Learn about this aggressive skin cancer. Find out ...
Mesenteric ischemia
This condition can come on suddenly or develop ove...
Mesenteric lymphadenitis
This condition involves swollen lymph nodes in the...
Mesothelioma
Learn about this uncommon cancer that's linked to ...
Metabolic syndrome
Having three or more specific risk factors, such a...
Metachromatic leukodystrophy
This rare genetic disorder causes fatty substances...
Metatarsalgia
Metatarsalgia is a condition in which the ball of ...
Microcephaly
Learn more about microcephaly, when an infant's he...
Microscopic colitis
Persistent, watery diarrhea could be a sign of mic...
Migraine
Find out about painful migraines that can last hou...
Migraine with aura
Learn more about migraine that causes pain and sen...
Mild cognitive impairment (MCI)
Learn more about this stage between the typical co...
Milk allergy
Find out what happens when the immune system react...
Miscarriage
Learn what might cause the loss of a pregnancy, th...
Mitral valve disease
Learn more about diseases that affect the valve be...
Mitral valve prolapse
This heart condition, also called Barlow syndrome,...
Mitral valve regurgitation
Learn more about the symptoms and treatment of thi...
Mitral valve stenosis
When the valve between the left heart chambers is ...
Mittelschmerz
Some women experience pain on one side of the lowe...
Mixed connective tissue disease
Mixed connective tissue disease has signs and symp...
Molar pregnancy
This rare pregnancy complication requires early tr...
Mold allergy
Coughing, sneezing and itchy eyes often accompany ...
Moles
Learn about moles (nevi), what causes them, whethe...
Molluscum contagiosum
Learn how to prevent and treat this common skin in...
Monoclonal gammopathy of undetermined significance (MGUS)
When bone marrow produces an unusual protein in th...
Mononucleosis
Learn about the symptoms and treatment of the kiss...
Mood disorders
Specialists in psychiatry and psychology at Mayo C...
Morning sickness
Learn more about nausea and vomiting during pregna...
Morphea
Learn more about this rare, painless skin conditio...
Morton's neuroma
Learn how this painful foot disorder is diagnosed,...
Mosquito bites
Learn about the many ways to prevent mosquito bite...
Mouth cancer
Learn what doctors and dentists look for when diag...
Moyamoya disease
This rare disorder occurs when blood flow to the b...
Multiple endocrine neoplasia, type 1 (MEN 1)
Learn about diagnosis and treatment for multiple e...
Multiple endocrine neoplasia, type 2 (MEN 2)
Learn about this rare disorder that causes tumors ...
Multiple myeloma
Learn about this cancer that forms from white bloo...
Multiple sclerosis
This nervous system disorder causes a range of sym...
Multiple system atrophy (MSA)
This rare neurological disorder affects the body's...
Multisystem inflammatory syndrome in children (MIS-C) and COVID-19
Learn about symptoms of MIS-C, a serious condition...
Mumps
Find out more about the symptoms and treatment of ...
Muscle cramp
Learn about this sudden, painful tightening of a m...
Muscle strains
Minor strains may only overstretch a muscle or ten...
Muscular dystrophy
Read about different types of this progressive dis...
Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS)
This complicated disorder may be triggered by an i...
Myasthenia gravis
A breakdown in the communication between nerves an...
Myelodysplastic syndromes
Learn how medications and bone marrow transplants ...
Myelofibrosis
Find out more about this bone marrow cancer. Learn...
Myocardial ischemia
Myocardial ischemia reduces blood flow to the hear...
Myocarditis
Learn about the diagnosis and treatment of this in...
Myoclonus
These uncontrollable jerking motions, which includ...
Myofascial pain syndrome
In this condition, pressure on trigger points can ...
Myxofibrosarcoma
Learn about this connective tissue cancer that oft...
Nail fungus
Learn about symptoms, treatment and prevention of ...
Narcissistic personality disorder
This mental disorder includes an unreasonably high...
Narcolepsy
Learn more about this sleep disorder that causes p...
Nasal and paranasal tumors
Learn about these cancerous and noncancerous growt...
Nasal polyps
These painless, noncancerous growths can lead to a...
Nasopharyngeal carcinoma
Nasopharyngeal carcinoma is cancer that occurs in ...
Nearsightedness
Tired of squinting at objects in the distance? The...
Neck pain
This common ailment can be the result of poor post...
Nephrogenic systemic fibrosis
Learn about symptoms, risk factors and possible tr...
Nephrotic syndrome
Swelling around your feet and ankles is a common s...
Neuroblastoma
Learn more about the symptoms, diagnosis and treat...
Neurodermatitis
Learn about this itchy skin condition that can dis...
Neuroendocrine tumors
Learn about the types of tumors that make up this ...
Neurofibroma
Learn about this type of peripheral nerve tumor th...
Neurofibromatosis
This genetic disorder causes tumors on nerve tissu...
Neuromyelitis optica
Understand more about this condition that affects ...
Nickel allergy
Nickel allergy, often caused by nickel in jewelry,...
Nicotine dependence
Nicotine dependence can be tough to kick, but trea...
Niemann-Pick
Niemann-Pick β€” Learn more about this inherited d...
Nightmare disorder
Nightmare disorder involves disturbing or scary dr...
Non-Hodgkin's lymphoma
Learn more about the symptoms, risk factors and tr...
Nonalcoholic fatty liver disease
Nonalcoholic fatty liver disease is becoming more ...
Nonallergic rhinitis
Many things can trigger this problem. Learn how to...
Nonmelanoma skin cancer
Learn about treatment options for all types of non...
Noonan syndrome
This genetic condition stops typical development i...
Norovirus infection
This highly contagious virus spreads through conta...
Obesity
Obesity isn't just a cosmetic concern. It is a med...
Obsessive-compulsive disorder (OCD)
OCD features a pattern of unwanted thoughts and fe...
Obstructive sleep apnea
Learn the signs that point to this common and pote...
Occupational asthma
Dust, fumes and other substances you come into con...
Ocular rosacea
Learn about symptoms, causes and treatments of ocu...
Oligodendroglioma
Learn about this type of tumor that can occur in t...
Oppositional defiant disorder (ODD)
This childhood mental health condition includes fr...
Optic neuritis
Learn about this painful eye disorder that affects...
Oral lichen planus
This chronic inflammatory condition results in whi...
Oral thrush
Oral thrush is a fungal infection caused by the ov...
Orchitis
This inflammation of one or both testicles can cau...
Orthostatic hypotension (postural hypotension)
This form of low blood pressure might cause dizzin...
Osteoarthritis
This most common form of arthritis mainly affects ...
Osteochondritis dissecans
Osteochondritis dissecans most commonly affects ch...
Osteomyelitis
Bones don't easily get infected, but certain situa...
Osteoporosis
Fractures associated with this bone-weakening cond...
Osteosarcoma
Learn about the symptoms and causes of this bone c...
Ovarian cancer
Learn more about cancer of the ovaries, including ...
Ovarian cysts
Many women have ovarian cysts at some time. Most a...
Ovarian hyperstimulation syndrome
Learn about this possible complication of fertilit...
Overactive bladder
Learn how you can get relief for frequent, sudden ...
Paget's disease of bone
Find out about this condition that can make bones ...
Paget's disease of the breast
This rare form of breast cancer causes breast skin...
Painful intercourse (dyspareunia)
Painful intercourse can occur in women for various...
Pancreatic cancer
Learn about symptoms, risk factors, prevention, di...
Pancreatic cysts
Most pancreatic cysts are benign, but some types a...
Pancreatic neuroendocrine tumors
Learn about these cancers that start in the hormon...
Pancreatitis
Pancreatitis can occur suddenly or build up over t...
Panic attacks and panic disorder
Learn about effective treatment for sudden episode...
Paraganglioma
Learn about this rare tumor that begins in nerve c...
Paraneoplastic syndromes of the nervous system
This group of uncommon disorders affects people wh...
Parkinson's disease
There's no cure for this progressive movement diso...
Parotid tumors
Learn about symptoms and diagnosis of parotid glan...
Partial anomalous pulmonary venous return
In this heart problem present at birth, some of th...
Parvovirus infection
Learn more about the symptoms, causes, treatment a...
Patellar tendinitis
Jumper's knee β€” a common knee injury β€” affects...
Patellofemoral pain syndrome
This pain at the front of the knee is more common ...
Patent ductus arteriosus (PDA)
Learn about symptoms, causes and treatment of this...
Patent foramen ovale
Learn more about the causes and complications of t...
Peanut allergy
Peanut allergy can be serious. Find out what you n...
Pectus excavatum
Pectus excavatum causes the breastbone to sink int...
Pediatric brain tumors
Pediatric brain tumors include medulloblastoma, gl...
Pediatric obstructive sleep apnea
Understand this condition that can cause your chil...
Pelvic inflammatory disease (PID)
This serious infection of the female reproductive ...
Pemphigus
Learn about symptoms, causes, treatment and self-c...
Penicillin allergy
Understand the importance of an accurate diagnosis...
Peptic ulcer
Feeling a dull or burning pain in your stomach? It...
Pericardial effusion
Learn the symptoms, causes and treatment of excess...
Pericarditis
Inflammation of the tissue surrounding the heart c...
Perimenopause
Discover effective treatments and learn self-care ...
Periodontitis
This serious gum infection damages the soft tissue...
Peripheral artery disease (PAD)
Learn more about this common blood flow condition ...
Peripheral nerve injuries
These types of injuries affect the nerves that lin...
Peripheral nerve tumors
Learn about these growths that form in or near ner...
Peripheral neuropathy
Learn what may cause the prickling, tingling or nu...
Peritonitis
Learn about the causes, symptoms and treatment of ...
Persistent depressive disorder
This type of depression may cause you to feel sad ...
Persistent post-concussive symptoms (Post-concussion syndrome)
Find out what to do when symptoms such as headache...
Personality disorders
A person with this mental health condition thinks,...
Pet allergy
Family pet making you sneeze? Find out about diagn...
Peyronie's disease
Understand what causes bent and painful erections,...
Phenylketonuria (PKU)
PKU is caused by a change in the gene that helps c...
Pheochromocytoma
Find out more about the symptoms, causes and treat...
Pilonidal cyst
Learn about causes, symptoms and treatments of thi...
Pinched nerve
Pressure on a nerve can lead to numbness, tingling...
Pineoblastoma
Learn about this rare cancer that begins in the br...
Pink eye (conjunctivitis)
This highly contagious eye condition can be itchy ...
Pinworm infection
Learn more about the symptoms, treatment and preve...
Pituitary tumors
Learn more about the symptoms, causes and treatmen...
Pityriasis rosea
Learn more about the symptoms, causes and treatmen...
Placenta accreta
During pregnancy, if part of the placenta grows to...
Placenta previa
Learn about how this pregnancy complication is dia...
Placental abruption
This uncommon pregnancy complication, in which the...
Plague
Learn about the symptoms, risk factors and treatme...
Plantar fasciitis
Learn about this most common cause of stabbing hee...
Plantar warts
Learn about the causes, treatment and prevention o...
Pleurisy
In this condition, the tissues that line the lungs...
Pneumonia
Pneumonia β€” Learn about the symptoms, causes and...
Pneumonitis
Pneumonitis is a general term for lung inflammatio...
Pneumothorax
A collapsed lung occurs when air leaks into the sp...
Poison ivy rash
Learn about the symptoms, causes and home remedies...
Polio
Learn more about this contagious viral illness tha...
Polycystic kidney disease
Learn how treatments and lifestyle changes might h...
Polycystic ovary syndrome (PCOS)
Polycystic ovaries, hormone imbalance and irregula...
Polycythemia vera
This slow-growing blood cancer mainly affects peop...
Polyhydramnios
Learn about symptoms, causes and treatment for pol...
Polymorphous light eruption
Learn more about the symptoms and treatments for t...
Polymyalgia rheumatica
Older adults who suddenly develop muscle pain and ...
Polymyositis
The muscle weakness associated with polymyositis c...
Popliteal artery entrapment syndrome
Calf pain cramping your style during a workout? Kn...
Porphyria
This group of disorders results from a buildup of ...
Post-polio syndrome
This syndrome causes a number of potentially serio...
Post-traumatic stress disorder (PTSD)
Post-traumatic stress disorder (PTSD) is a mental ...
Post-vasectomy pain syndrome
Learn about post-vasectomy pain syndrome (PVPS) β€...
Posterior cortical atrophy
This rare neurological syndrome that's often cause...
Posterior vaginal prolapse (rectocele)
In this pelvic floor disorder, the rectum presses ...
Postherpetic neuralgia
This complication of shingles can cause pain, itch...
Postpartum depression
Learn the risk factors and symptoms of depression ...
Postpartum preeclampsia
Learn about this rare condition that's typically a...
Prader-Willi syndrome
Prader-Willi syndrome is a rare genetic disorder t...
Precocious puberty
Read about what can cause children's bodies to beg...
Prediabetes
Blood sugar levels start to rise even before you g...
Preeclampsia
Learn about the diagnosis, treatment of this pregn...
Premature birth
Here's what you need to know about caring for a pr...
Premature ejaculation
Understand what may cause ejaculation to happen ea...
Premature ventricular contractions (PVCs)
Premature ventricular contractions (PVCs) are extr...
Premenstrual syndrome (PMS)
Mood swings, cramps and irritability are just a fe...
Presbyopia
Have you noticed β€” yet β€” having to hold books ...
Prescription drug abuse
Using a prescription medicine in a way not intende...
Preterm labor
Going into labor before your due date is serious, ...
Priapism
Understand the symptoms, possible causes and treat...
Primary biliary cholangitis
Primary biliary cholangitis is a type of liver dis...
Primary immunodeficiency
Frequent infections could mean you have an immune ...
Primary lateral sclerosis (PLS)
This motor neuron disease causes nerves within the...
Primary ovarian insufficiency
Primary ovarian insufficiency, also called prematu...
Primary progressive aphasia
Find out more about this type of dementia that aff...
Primary sclerosing cholangitis
Liver damage can result from this potentially seri...
Proctitis
Proctitis means inflammation of the rectal lining....
Progeria
This genetic disorder is extremely rare and progre...
Progressive supranuclear palsy
Learn about this brain disorder that interferes wi...
Prolactinoma
Learn how this pituitary gland tumor alters certai...
Prostate cancer
Learn about detection, diagnostic approaches, trea...
Prostatitis
Learn about tests and treatments for disorders of ...
Pseudobulbar affect
Pseudobulbar affect β€” Overview covers symptoms, ...
Pseudocholinesterase deficiency
This causes sensitivity to certain muscle relaxant...
Pseudogout
This disease mimics gout, causing sudden, painful ...
Pseudomembranous colitis
This inflammatory colon condition is usually cause...
Pseudotumor cerebri (idiopathic intracranial hypertension)
Headaches and vision loss can result from this inc...
Psoriasis
Learn about this common skin condition that causes...
Psoriatic arthritis
This form of arthritis affects some people who hav...
Pubic lice (crabs)
Pubic lice (crabs) are an itchy, but treatable, nu...
Pulmonary atresia
Learn more about this life-threatening congenital ...
Pulmonary atresia with intact ventricular septum
Also called PA/IVS, this rare congenital heart def...
Pulmonary atresia with ventricular septal defect
This congenital heart defect affects the valve bet...
Pulmonary edema
Get more information about the causes of this pote...
Pulmonary embolism
A blood clot blocks and stops blood flow to an art...
Pulmonary fibrosis
Pulmonary fibrosis β€” Learn about the symptoms, c...
Pulmonary hypertension
This lung condition makes the heart work harder an...
Pulmonary valve stenosis
When the valve between the heart and lungs is narr...
Pyloric stenosis
In this condition, a valve between an infant's sto...
Pyoderma gangrenosum
Learn about the symptoms, treatment and risk facto...
REM sleep behavior disorder
REM sleep behavior disorder is a sleep disorder in...
Rabies
Learn about this deadly virus that most often spre...
Radiation enteritis
This complication of radiation therapy for cancer ...
Radiation sickness
Read about what happens when someone is exposed to...
Ramsay Hunt syndrome
A shingles outbreak can affect the facial nerve ne...
Raynaud's disease
Learn how this disease causes parts of the body, m...
Reactive arthritis
This joint pain is triggered by an infection in an...
Reactive attachment disorder
Reactive attachment disorder is when an infant or ...
Rectal cancer
Find out about rectal cancer symptoms, causes and ...
Rectal prolapse
This rare condition happens when the rectum slips ...
Rectovaginal fistula
This open tunnel connects the rectum and vagina, a...
Recurrent breast cancer
Learn about symptoms that alert doctors to a breas...
Renal artery stenosis
Read more about what happens when the arteries lea...
Residual limb pain
This common pain in the part of a limb that remain...
Respiratory syncytial virus (RSV)
This common illness affects the lungs. It can seem...
Restless legs syndrome
Uncomfortable sensations in your legs can interrup...
Retinal detachment
Eye floaters and reduced vision are signs of possi...
Retinal diseases
Learn about the symptoms, diagnosis and treatment ...
Retinoblastoma
Learn about the symptoms, causes and treatments fo...
Retractile testicle
Find out about this condition that allows the test...
Retrograde ejaculation
Learn about the symptoms and treatment options for...
Rett syndrome
This rare genetic disorder affects the way the bra...
Reye's syndrome
Learn more about the causes and treatment of Reye'...
Rhabdomyosarcoma
RMS, a rare soft tissue cancer, affects children m...
Rheumatic fever
Learn about this serious complication of strep thr...
Rheumatoid arthritis
This chronic inflammatory disorder can affect more...
Rickets
Learn what can cause this bone-softening disease i...
Ringworm (body)
Learn more on causes, symptoms, treatments of this...
Ringworm (scalp)
Learn more on causes, symptoms, treatments of this...
Rosacea
Learn more about this common facial skin condition...
Roseola
Learn about the causes of and home-care tips for t...
Rotator cuff injury
This common shoulder disorder is often caused by r...
Rotavirus
Learn more about this common childhood condition t...
Rubella
Learn more about the symptoms and prevention of th...
Rumination syndrome
Learn about this condition that results in repetit...
Ruptured eardrum (perforated eardrum)
A ruptured eardrum is a hole or tear in your eardr...
Ruptured spleen
A break in the surface of your spleen, usually fro...
Sacral dimple
Learn about the causes, complications and diagnosi...
Sacroiliitis
This joint inflammation can cause pain in the butt...
Salivary gland tumors
Learn about this rare tumor that forms in the sali...
Salmonella infection
This common bacterial infection is spread through ...
Sarcoidosis
This inflammatory disease results in growth of tin...
Sarcoma
Learn about this cancer that forms in the bones an...
Scabies
Learn more about this contagious condition that ca...
Scarlet fever
Learn more about the symptoms, causes, complicatio...
Schizoaffective disorder
This mental health disorder includes schizophrenia...
Schizoid personality disorder
People with this mental health condition do not wa...
Schizophrenia
This severe mental disorder can result in hallucin...
Schizotypal personality disorder
This personality disorder may include odd or eccen...
Schwannoma
Learn about the diagnosis and treatment of this us...
Sciatica
Pressure on the sciatic nerve can cause pain and o...
Scleroderma
This group of rare diseases involves the hardening...
Sclerosing mesenteritis
In sclerosing mesenteritis, tissue in the abdomen ...
Scoliosis
This sideways curvature of the spine occurs most o...
Scorpion sting
Learn more about symptoms, risk factors, treatment...
Scrotal masses
Lumps in the scrotum have various causes. Even pai...
Seasonal affective disorder (SAD)
This type of depression is related to changes in s...
Sebaceous carcinoma
Learn about diagnosis and treatments for this rare...
Seborrheic dermatitis
Find out what you can do to treat this flaky skin ...
Seborrheic keratosis
Learn more about the symptoms and treatments of th...
Secondary hypertension
Learn more about high blood pressure that's caused...
Seizures
Learn about the different types of seizures and wh...
Self-injury/cutting
Deliberately hurting your own body, such as by cut...
Separation anxiety disorder
Intense or prolonged separation anxiety that inter...
Sepsis
Learn more about the symptoms and treatment of sep...
Septic arthritis
Learn about this painful infection in a joint and ...
Serotonin syndrome
Learn how certain drug interactions or an increase...
Severe acute respiratory syndrome (SARS)
Learn about this contagious and sometimes fatal re...
Sex headaches
Learn about the causes and treatment of this type ...
Sexually transmitted diseases (STDs)
Find out the symptoms of STDs and what you can do ...
Shaken baby syndrome
Understand why shaking a baby can cause brain dama...
Shellfish allergy
It's possible to be allergic to some types of shel...
Shigella infection
Shigella infection is an intestinal infection that...
Shin splints
Shin splints are common in runners, dancers and mi...
Shingles
Learn more about symptoms, causes, treatment and v...
Short bowel syndrome
Short bowel syndrome occurs when part of the small...
Sick sinus syndrome
This heart rhythm disorder causes slow, paused or ...
Sickle cell anemia
Learn about the symptoms, causes and treatment of ...
Sinus headaches
Sinus headaches are often to blame for headache wi...
Sjogren's syndrome
If you're bothered by dry eyes and mouth, talk to ...
Skin cancer
Learn about skin cancer, including basal cell carc...
Sleep apnea
Snoring loudly could be an indication of sleep apn...
Sleep terrors (night terrors)
Sleep terrors (night terrors) are episodes of scre...
Sleepwalking
Comprehensive overview covers causes, treatment an...
Small bowel cancer
This type of cancer starts in the small intestine....
Small bowel prolapse (enterocele)
Learn more about this condition also called a vagi...
Small intestinal bacterial overgrowth (SIBO)
Small intestinal bacterial overgrowth (SIBO) can o...
Small vessel disease
Also called coronary microvascular disease, this t...
Smallpox
Learn about the symptoms, causes and vaccine preve...
Snoring
Is the sound of snoring disrupting sleep in your h...
Social anxiety disorder (social phobia)
Learn more on this disorder where everyday interac...
Soft palate cancer
Learn about the symptoms of this type of cancer th...
Soft tissue sarcoma
This rare type of cancer can begin in the muscles,...
Solitary fibrous tumor
This rare type of tumor most often occurs near the...
Solitary rectal ulcer syndrome
Solitary rectal ulcer syndrome is a rare condition...
Somatic symptom disorder
Learn about symptoms, causes and treatment for thi...
Sore throat
Find out what causes this common affliction, when ...
Specific phobias
These are extreme fears of objects or situations t...
Spermatocele
Learn more about this noncancerous testicular diso...
Spider bites
Learn more about prevention, symptoms, complicatio...
Spina bifida
Fetal surgery during pregnancy may improve outcome...
Spinal arteriovenous malformation (AVM)
Learn more about how this rare blood vessel disord...
Spinal cord injury
Learn more about what happens after your spinal co...
Spinal cord tumor
Spinal cord tumors can cause serious problems such...
Spinal headaches
These headaches can happen after a spinal tap proc...
Spinal stenosis
This condition narrows the amount of space within ...
Spontaneous coronary artery dissection (SCAD)
A torn blood vessel in the heart can cause a heart...
Sprained ankle
Sprained ankle β€” Injury to a ligament of the ank...
Sprains
A sprain is a stretching or tearing of ligaments β...
Squamous cell carcinoma of the skin
This common skin cancer usually looks like a bump ...
Stage 4 prostate cancer
Find out about diagnosis and treatment of this can...
Staph infections
Learn about the symptoms, causes and treatment of ...
Stevens-Johnson syndrome
Learn more about the causes of this rare disorder ...
Stickler syndrome
This genetic disorder can cause serious vision, he...
Stomach cancer
Stomach cancer, which is also called gastric cance...
Stomach polyps
These masses of cells that form on your stomach li...
Strep throat
Learn more about the symptoms, causes and treatmen...
Stress fractures
Stress fractures are tiny cracks in bones often ca...
Stress incontinence
Coughing, laughing, running β€” all can lead to ac...
Stretch marks
Find out the symptoms of and treatment for this pa...
Stroke
Promptly spotting stroke symptoms leads to faster ...
Stuttering
Stuttering, sometimes called stammering, is a spee...
Stye (sty)
A stye (sty) is a painful red bump along the eyela...
Subarachnoid hemorrhage
Find out more about diagnosis and treatment option...
Subconjunctival hemorrhage (broken blood vessel in eye)
Subconjunctival hemorrhage is a broken blood vesse...
Sudden cardiac arrest
This medical emergency involves sudden loss of all...
Sudden infant death syndrome (SIDS)
Learn about the unexplained death of a young baby ...
Suicide and suicidal thoughts
Suicide can be prevented. Learn suicide warning si...
Sun allergy
Learn more about the causes, symptoms and treatmen...
Sunburn
Learn more about how UV rays harm your skin and ...
Supraventricular tachycardia
SVT is an irregularly fast heartbeat. For many peo...
Suspicious breast lumps
Most of these growths aren't cancer, but you shoul...
Sweating and body odor
Learn more about the causes, treatment and self-ca...
Swimmer's ear
The moist environment from water remaining in your...
Swimmer's itch
Learn more about the symptoms, treatment and preve...
Swollen knee
This condition can be caused by trauma, overuse in...
Swollen lymph nodes
Learn more about swollen lymph nodes, including po...
Synovial sarcoma
This rare type of cancer tends to occur near large...
Syphilis
Understand how syphilis spreads, what you can do f...
Syringomyelia
The development of a fluid-filled cyst in the spin...
Systemic mastocytosis
Excess mast cells can build up in skin, bone and o...