Peanut allergy is caused by an immune system malfunction. Your immune system identifies peanuts as harmful triggering the production of immunoglobulin E (IgE) antibodies to neutralize the peanut protein (allergen). The next time you come in contact with peanuts, these IgE antibodies recognize it and signal your immune system to release histamine and other chemicals into your bloodstream.
Histamine and other body chemicals cause a range of allergic signs and symptoms. Histamine is partly responsible for most allergic responses, including runny nose, itchy eyes, dry throat, rashes and hives, nausea, diarrhea, labored breathing and even anaphylactic shock.