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Adenoiditis is an inflammation of the adenoids, which are small areas of tissue at the back of the nose and throat. They are part

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

Amblyopia, commonly called "lazy eye," is an eye condition in which one eye is not used enough for the visual system in the brain

The amniotic sac, or amnion, is a lining (membrane) inside the uterus that contains the fetus and the fluid that cushions the

Amniocentesis is a test to study the liquid (amniotic fluid) that surrounds a baby. Amniotic fluid contains cells and other

Allergy shots are a type of immunotherapy to help treat allergic rhinitis and allergic asthma. Small doses of substances