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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

Aspiration pneumonia is an inflammation of the lungs caused by breathing in foreign material, such as food, liquid, vomit, or

Arthrodesis is a type of surgery that joins (fuses) 2 bones in a diseased joint so that the joint can no longer move. It may be

An angiogram is an X-ray test that provides pictures of the blood flow in a blood vessel. During an angiogram, a material that

Atopy (say "AT-uh-pee") is a predisposition to have allergic reactions. People who have this predisposition are called atopic (say