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A person eats the substance for the first time that causes an allergic reaction
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Then the body makes an antibody that detects the bad substance
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The antibody attaches itself to tissues all over the body waiting for the substance
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When the substance enters the body again, the antibodies send out a signal to the body to release large amounts of histamine
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The histamine causes the body to irritation and swelling
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The result of irritation is different depending on the person, it varies from hives, asthma, to anaphylaxis
