-
When a person eats an allergen, or substance that causes an allergic reaction for the first time.
-
Once the allergen is eaten, the body creates an antibody or a protein that detects the harmful substances.
-
The 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.
-
If 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.
-
The result of this irritation varies in person to person, from mild hives, to shortness of breath, to anaphylaxis, and if it isn't treated soon it could even cause death.
-
The histamine causes irritation and swelling in parts of the body. This is when people might get hives, itchy skin, etc.