An allergen is a substance that can cause an allergic reaction. In some people, the immune system thinks allergens are foreign or dangerous. This is what leads to allergy symptoms.
Common allergens include:
Wasserman SI. Approach to the patient with allergic or immunologic disease. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 257.
UPHS Contact Us
Site Map Privacy
The University of Pennsylvania Health System, Philadelphia, PA 1-800-789-PENN ©
2015, The Trustees of the University of Pennsylvania