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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

The immune system is the body's defense against foreign substances, such as bacteria or viruses, that may be harmful. An

The auditory nerve carries sound impulses from the inner ear to the brain. The brain "unscrambles" the auditory signals to make

Attention deficit hyperactivity disorder (ADHD) is a condition that makes it hard to pay attention and focus on tasks. People who

Atrophic vaginitis occurs when the lining of the vagina becomes thin and fragile because of decreased estrogen levels, usually

Atrioventricular septal defect is an opening between all four chambers of the heart that is present at birth (congenital heart