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Agoraphobia is an intense fear of being in public places. People who have agoraphobia are afraid of being in any place or

Acquired immunodeficiency syndrome (AIDS) is the most severe stage of HIV infection. HIV attacks and destroys a type of white

The adrenal glands are located above the kidneys. The hormones produced by the adrenal glands affect nearly every organ in the

Adhesive capsulitis is an inflammatory condition that restricts motion in a joint. It most often affects the shoulder joint, a

Adhesions are scar tissue that forms between two structures or organs inside the body that are not normally connected to each

Addison's disease is a rare condition that develops when the adrenal glands, located above the kidneys, are not able to produce

Acyanotic congenital heart disease includes heart problems that develop before or at birth but do not normally interfere with the

Allergens, also called antigens, are substances that can trigger an allergic reaction. Having allergies means that the body reacts

Amniotic fluid is the liquid that surrounds a developing baby (fetus) in the uterus throughout pregnancy. The amniotic fluid

Amino acids are the chemicals that make up proteins. The human body needs 20 different amino acids to function properly. Some