Allergic reaction is a sensitivity to a specific substance, called an allergen, that is contacted through the skin, inhaled into the lungs, swallowed or injected. The body's reaction to an allergen can be mild, such as a localized rash, or life-threatening, such as anaphylactic shock.
Review Date:5/18/2006
Reviewed By: A.D.A.M. Medical Illustration Team
Reviewed By: A.D.A.M. Medical Illustration Team
