If you are experiencing a medical emergency please dial 911 immediately
Allergens, also called antigens, are substances that can trigger an allergic reaction. Having allergies means that the body reacts to allergens as a harmful foreign substance.
Allergens may be:
Allergy symptoms may be controlled by avoiding exposure to allergens. Some people need medicines or allergy shots (immunotherapy) to control their body's reactions to the allergens.
Last Revised: June 17, 2013
Author: Healthwise Staff
Medical Review: E. Gregory Thompson, MD - Internal Medicine & Rohit K Katial, MD - Allergy and Immunology
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