Allergen

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Allergen

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:

Inhaled in the form of pollens, mold, chemicals, material from the stools of cockroaches and house dust mites, or animal dander and saliva. Animal dander is dead skin cells from an animal, such as a cat or dog. Animal hair or fur is not an allergen.
Eaten or taken by mouth, including foods, food supplements, home remedies, or medications.
Touched, such as cosmetics, plants, soaps or detergents, chemicals, metals, or latex (causing skin or contact allergies).
Applied to the skin, such as artificial nails, hair extensions, or henna tattoos.
Injected under the skin, such as medications or venom from the bites or stings of bees, yellow jackets, hornets, or other insects.

Allergy symptoms may be controlled by avoiding exposure to allergens. Some people need medications or allergy shots (immunotherapy) to control their body's reactions to the allergens.

Credits

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Author	Debby Golonka, MPH
Editor	Susan Van Houten, RN, BSN, MBA
Associate Editor	Pat Truman, MATC
Primary Medical Reviewer	Caroline S. Rhoads, MD - Internal Medicine
Specialist Medical Reviewer	Harold S. Nelson, MD - Allergy and Immunology
Last Updated	August 8, 2007

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Last updated:	August 08, 2007
Author:	Debby Golonka, MPH
Reviewed By:	Caroline S. Rhoads, MD - Internal Medicine, Harold S. Nelson, MD - Allergy and Immunology
Editors:	Susan Van Houten, RN, BSN, MBA, Pat Truman, MATC

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