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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

A drug allergy happens when the body's immune system overreacts to a substance (allergen) in a medicine that the person has taken

Amyotrophic lateral sclerosis (ALS), also known as Lou Gehrig's disease, is a progressive wasting away of the nerve cells in the

Anorexia nervosa (say "an-uh-RECK-see-uh nur-VOH-suh") is a type of eating disorder. People who have anorexia usually have a very

Anemia is a condition in which a person doesn't have enough red blood cells. With fewer red blood cells, your blood isn't able to