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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

Animal dander is loose skin cells (like dandruff) from animals such as dogs and cats. These skin cells, which contain secretions

Angioplasty is a procedure done to open a narrowed or blocked blood vessel so that blood can flow through it more easily. During

Angina happens when there is not enough blood flow to the heart muscle. This low blood flow is often a result of coronary artery

Anencephaly is a condition in which a fetus forms with a partially formed brain and spinal cord. A child with this condition will