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allergic reaction symptoms, severe (anaphylaxis)

symptoms of a severe allergic reaction (anaphylaxis) may include:

  • the sudden appearance of raised, red areas (hives) all over the body.
  • rapid swelling of the throat, mouth, or tongue.
  • trouble breathing.
  • passing out (losing consciousness). or you may feel very light-headed or suddenly feel weak, confused, or restless.
  • severe belly pain, nausea, vomiting, or diarrhea.

a severe reaction can be life-threatening. if you have had a bad allergic reaction to a substance before and are exposed to it again, treat any symptoms as an emergency. even if the symptoms are mild at first, they may quickly become very severe.

this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use. learn how we develop our content.

this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use and privacy policy. to learn more about healthwise, visit healthwise.org. © 1995-2022 healthwise, incorporated. healthwise, healthwise for every health decision, and the healthwise logo are trademarks of healthwise, incorporated.

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