Allergies: Allergy Symptoms, Treatment & Medicine

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Your Body On Allergies -- How to head off an attack early // (© ImagesBazaar/Getty Images)

common questions

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What are allergies?

An allergic reaction is an overreaction of the immune system to a substance called an allergen. Allergens include chemicals, foods, medicines, mold, plants, and pollen. Symptoms of an allergic reaction can range from mild and annoying to severe and life-threatening.