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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

The areola is the dark area of skin surrounding the nipple of the breast. The areola enlarges and darkens during pregnancy.

Atherosclerosis, sometimes called "hardening of the arteries," occurs when fat (cholesterol) and calcium build up in the wall of

Athlete's foot is a rash on the skin of your foot caused by a fungus. It can cause itching, peeling, and cracking on the bottoms

Astigmatism is an abnormal curvature of the clear outer covering of the eye (cornea), causing blurry vision. The cornea directs

Asthma is a long-term (chronic) disease of the respiratory system. It causes your airways to tighten and become narrow. This makes

Reye syndrome is a rare disease that occurs almost exclusively in children younger than age 15 and can cause severe liver and