Allergies are your body's reaction to a potentially harmful invader. When you come into contact with a normally harmless substance, such as pollen, your immune system (your body's defense system) may react. Allergens are the substances responsible for these reactions. Your body's reaction to the allergen is referred to as an allergic reaction. A chain of events leads to an allergic reaction. When you are allergic to something, your body produces allergic antibodies the first time you are exposed to it (such as pollen). The job of these antibodies is to detect allergens and help remove them from your system. As a result, histamine, a chemical that causes allergy symptoms, is released.
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