Know the possible symptoms of acute flaccid myelitis (AFM), a rare but serious condition that affects young children.
Disease
Acute liver failure
A rapid loss of liver function can happen in people who don't even have liver disease. Find out about symptoms, treatment and prevention of this serious medical emergency.
Disease
Anal fissure
Learn what causes a tear in the anus and how to prevent or treat this often painful condition.
Disease
Anal fistula
An infected anal gland can sometimes cause a tunnel to develop between the skin and the anus. Learn about symptoms and diagnosis for this painful, but treatable, condition.
Disease
Arteriovenous fistula
Irregular connections between arteries and veins may cause certain complications. Learn more about the causes and possible treatment options.
Disease
Athlete's foot
Learn about the causes, symptoms, prevention and treatment of this common fungal skin infection.
Disease
Atrial fibrillation
A fast, pounding heartbeat could be due to AFib, a type of heart rhythm problem. Know the warning signs and when treatment is needed.
Disease
Atrial flutter
Learn more about this condition in which the heart's upper chambers beat too quickly, causing a rapid, but usually regular, heart rhythm.
Disease
Bird flu (avian influenza)
Flu viruses in other animals, such as birds, may be a risk to people. Learn more about the symptoms, causes, prevention and treatment for bird flu in people.
Disease
Broken foot
This injury is painful but rarely needs surgery for repair. Healing can take weeks to months.
Disease
CSF leak (Cerebrospinal fluid leak)
Cerebrospinal fluid leaks may start in the brain or spine, causing headaches, dizziness and other symptoms.
Disease
Cystic fibrosis
This condition, passed down in families, causes damage to the lungs, digestive system and other organs. Learn about screening and newer treatments.