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Person eats an alleged or substance that causes an allergic reaction for first time.
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The body creates an antibody
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The antibody attaches itself to cells in the body in preparation for the allergen
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The allergen attaches to the antibody and send out a signal telling the body to release histamine whenever allergic enters the body
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Histamine causes irritation in body.
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Irritation is different for everyone and occurs in different parts of body
