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a person eats an substance that causes an allergic reaction for the first time
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when the person eats the substance 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 parts of the body
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the irritation varies in person to person from mild hives, shortness of breath, to anaphylaxis
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