Skip to Content
Home > Wellness > Health Library > Anaphylaxis
Browse and register for related classes.
Anaphylaxis (say "ann-uh-fuh-LAK-suss") is a severe allergic reaction that affects the entire
body (systemic). It can occur within a few seconds or minutes after a person is
exposed to a substance (allergen or antigen).
Symptoms and signs of a severe allergic reaction may
The sooner symptoms occur after exposure to the substance, the more
severe the anaphylactic reaction is likely to be. An anaphylactic reaction may
occur with the first exposure to an allergen, with every exposure, or after
several exposures. An anaphylactic reaction can be life-threatening and is a
medical emergency. Emergency care is always needed for an anaphylactic
Current as of:
February 12, 2016
William H. Blahd, Jr., MD, FACEP - Emergency Medicine & Adam Husney, MD - Family Medicine & H. Michael O'Connor, MD - Emergency Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2016 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.
250 Pleasant Street
Concord, NH 03301
Share Feedback and Questions
View Quality Data
© 2017 Concord Hospital