Anaphylaxis is a term used to describe a severe allergic reaction. It is not common, but it can be life-threatening and requires emergency care. Symptoms may appear in a few seconds or minutes or be delayed for several hours after contact with the substance that caused the reaction. The sooner symptoms appear, the more severe the reaction is likely to be.
Last Revised: May 20, 2011
Author: Healthwise Staff
Medical Review: William H. Blahd, Jr., MD, FACEP - Emergency Medicine & David Messenger, MD
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