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
April 8, 2013
William H. Blahd, Jr., MD, FACEP - Emergency Medicine & H. Michael O'Connor, MD - Emergency Medicine
How this information was developed to help you make better health decisions.
To learn more visit Healthwise.org
© 1995-2013 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
We are happy to take your appointment request over the phone, or, you may fill out an online request form.
Disclaimer: The information on this website is for general informational purposes only and SHOULD NOT be relied upon as a substitute for sound professional medical advice, evaluation or care from your physician or other qualified health care provider.