Causes of Allergy:
Any allergy starts when your immune system mistakes a harmless substance for a dangerous one. The immune system then produces antibodies that remain on the alert for that particular allergen. When you're exposed to the allergen again, these antibodies can release a number of immune system chemicals that cause allergy symptoms.
Common allergy triggers include:·
Airborne allergens, such as pollen, animal dander, dust mites andmold·
Certain foods, particularly peanuts, tree nuts, wheat, soy, fish, shellfish, eggs, and milk·
Insect stings, such as from a bee or wasp·
Medications, particularly penicillin or penicillin-based antibiotics·
Latex or other substances you touch, which can cause allergic skin reactions