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A drug allergy happens when the body's immune system overreacts to a substance (allergen) in a medicine that the person has taken

Amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, is a progressive wasting away of the nerve cells in the

Anorexia nervosa (say "an-uh-RECK-see-uh nur-VOH-suh") is a type of eating disorder. People who have anorexia usually have a very

Anemia is a condition in which a person doesn't have enough red blood cells. With fewer red blood cells, your blood isn't able to

An aneurysm is a bulging section in the wall of a blood vessel that has become stretched out and thin. As the wall of the blood

Angioedema is swelling that develops under the skin and in the tissues that line some organs. Painful swelling can develop on the

Angular cheilitis (also called perlèche, cheilosis, or stomatitis) is a condition with deep cracks and splits at the corners of

Ankylosing spondylitis is a form of joint inflammation (arthritis) that is long-lasting (chronic) and most often affects the spine

Anaphylaxis (say "ann-uh-fuh-LAK-suss") is a severe allergic reaction that affects the entire body (systemic). It can occur within

An anorectal abscess is a pocket of pus in the tissue near the end of the rectum (anus). Most abscesses are caused by a blocked