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Step One
A person eats an allergen, or substance that causes an allergic reaction for the first time. -
Step Two
When the person eats the allergen, the body creates an antibody, or a protein that detects harmful substances. -
Step Three
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. -
Step Four
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. -
Step Five
The histamine causes irritation and swelling in parts of the body. -
Step Six
The result of this irritation varies in person to person, from mild hives, shortness of breath, to anaphylaxis.
