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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

Amebiasis (amebic dysentery) is a parasitic infection of the large intestine and sometimes the liver. More common in developing

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

Allergy to metal An allergic reaction to metal is an overreaction of the body's immune system to a substance (allergen) in a metal

An allergic reaction occurs when the immune system overreacts to an allergen in the venom of a stinging or biting insect. Symptoms

Allergic asthma is an overreaction of the immune system to a substance (allergen) that results in symptoms of an asthma attack

Allergic rhinitis means allergies or hay fever. When you are exposed to particles in the air that you're allergic to, like pollen

An allergic reaction is an overreaction of the immune system to a substance called an allergen. Allergens include chemicals, foods

Alzheimer's disease damages the brain and causes a steady loss of memory and of how well you can speak, think, and do your daily