Definition: An allergy is any immune system reaction involving Immunoglobulin E to a substance usually thought of as benign, such as food or pollen.
Also Known As: allergic reaction
Allergy
From Victoria Groce, former About.com Guide
Updated May 05, 2008
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
More About Food Allergies
Recognizing and Treating Allergic Reactions
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