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The aortic valve separates the lower left chamber (left ventricle) of the heart and the aorta, the large artery that carries blood

Anxiety disorders are a type of mental illness. Someone who has an anxiety disorder has severe anxiety that interferes with his or

Antibodies are proteins made by the body's natural defense system (immune system) to fight foreign substances, such as bacteria

Apgar scores are measurements and observations made by a health professional at 1 and 5 minutes after birth to assess a newborn's

Blood thinners are medicines that prevent blood clots. They do not actually thin the blood but increase the time it takes to form

Antihistamines are medicines that may relieve allergy symptoms and itching. Many are available without a prescription. Nondrowsy

An antigen is a substance (such as part of a virus or bacteria) that triggers the immune system to produce cells (antibodies) that

Arthritis is inflammation of a joint. Symptoms of arthritis may include pain, swelling, redness, warmth, and limitation of

Arthroscopy is a procedure used to examine the inside of a joint by inserting a thin tube (arthroscope) containing a camera and

Assisted reproductive technology (ART) describes several different medical procedures that can help you become pregnant. The most