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A person eats an allergen or substance, that causes a reaction for the first time.
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When the person eats the allergen, the body creates an antibody, or a protein that detects harmful substances.
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This antibody, attaches itself to cells found in tissues all over the body in order to prepare the body for if that allergen enters the body again.
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When the food allergen enters the body again, the allergen binds to the antibodies and sends out signals to the body to release large amounts of histamine.
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The histamine causes irritation and swelling in large parts of the body.
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The result of this irritation varies person to person, from mild hives, shortness of breathe, to anaphylaxis.
