An allergy is an immune response to a substance that is not generally harmful. Results from the Third National Health and Nutrition Examination Survey in 2005 showed that more than half of all U.S. citizens (54.6 percent) test positive to one or more allergens. Allergies act up when the immune system reacts to a foreign substance entering the body. The immune system produces proteins called IgE (Immunoglobulin E) antibodies. When a person is allergic to the foreign substance, the immune system makes antibodies that identify the allergen as something harmful, even when it isn't. This triggers histamines and other substances to be released, which cause allergy symptoms.
Common types of allergies include:
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