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Causes
By Mayo Clinic staffAn allergy starts when the immune system mistakes a normally harmless substance for a dangerous invader. The immune system then produces antibodies that are always on the alert for your particular allergen. When you're exposed to the allergen again in the future, these antibodies release a number of immune system chemicals, such as histamine, that cause allergy symptoms.
Common allergy triggers include:
- Airborne allergens, such as pollen, animal dander, dust mites and mold
- Certain foods, particularly peanuts, tree nuts, wheat, soy, fish, shellfish, eggs and milk
- Insect stings, such as bee stings or wasp stings
- Medications, particularly penicillin or penicillin-based antibiotics
- Latex or other substances you touch, which can cause allergic skin reactions
- Allergy. National Institute of Allergy and Infectious Diseases. http://www.nlm.nih.gov/medlineplus/allergy. Accessed Jan. 7, 2009.
- Frequently Asked Questions (FAQ). American College of Allergy, Asthma & Immunology. http://www.acaai.org/public/questions/frequent.htm. Accessed Jan. 7, 2009.
- Tips to Remember: What is an allergic reaction? American Academy of Allergy, Asthma & Immunology. http://www.aaaai.org/patients/publicedmat/tips/whatisallergicreaction.stm. Accessed Jan. 7, 2009.
- Bauer BA. Mayo Clinic Book of Alternative Medicine. New York, N.Y.: Time Inc.; 2007:156-157.
