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Pollen, lactose, cat dander, etc. enters the body
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Your immune system indentifies the the foreign object as an invader or allergen.
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Immune system overreacts by producing antibodies. These antibodies are called Immunoglobulin.
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The antibodies travel to cells that release chemicals.
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The chemical that are released cause an allergic reaction.
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This reaction in your body usually cause symptoms in the nose, throat, skin, ears, eyes, sinuses, or the stomach.