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What to do if…
you develop hives, facial swelling, throat tightness, or hoarseness after a possible allergen

Produced and maintained by PanicStation.org Published: Last reviewed: Editorial policy USA guide

Short answer

Throat tightness, hoarseness, trouble breathing or swallowing, or swelling of the lips, tongue, or mouth after a possible allergen may be anaphylaxis. Use your prescribed epinephrine device immediately and call 911; if you do not have epinephrine, call 911 now.

Do not do these things

  • Do not wait to see whether throat, breathing, swallowing, faintness, or rapidly increasing swelling symptoms settle.
  • Do not use an antihistamine instead of epinephrine for severe symptoms.
  • Do not delay emergency action while trying to identify the allergen.
  • Do not drive yourself if you have airway symptoms, feel faint, or have used epinephrine.
  • Do not stand or walk around during a suspected severe reaction.
  • Do not stay alone when another person can safely remain with you.
  • Do not take food, drink, or oral medicine if breathing or swallowing is difficult.
  • Do not assume that improvement after epinephrine means the reaction cannot return.

What to do now

  1. If you have throat tightness, hoarseness, trouble breathing or swallowing, swelling of the lips, tongue, or mouth, faintness, confusion, rapidly worsening symptoms, or hives or facial swelling together with significant gastrointestinal symptoms such as repeated vomiting, diarrhea, or severe abdominal cramping, use your prescribed epinephrine auto-injector or nasal spray immediately as directed.
  2. Call 911 immediately, whether or not epinephrine is available. Tell the dispatcher that this may be anaphylaxis, describe the symptoms, and say when epinephrine was used.
  3. Lie flat, raise your legs, and keep still if you can breathe comfortably. If breathing is difficult, sit up; if you are vomiting, lie on your side. Do not stand or walk.
  4. Ask someone to stay with you, unlock the door for emergency responders, and bring your epinephrine devices and allergy action plan if they are nearby.
  5. If symptoms are not improving after about five minutes, or they return, use a second prescribed epinephrine device if available, following its instructions or your allergy action plan.
  6. Stop further exposure only when this is quick and safe, such as stopping eating or moving away from an insect. Do not delay epinephrine or the 911 call to do this.
  7. If you have only hives or mild facial puffiness with no throat, breathing, swallowing, faintness, significant gastrointestinal symptoms such as repeated vomiting, diarrhea, or severe abdominal cramping, or rapidly worsening symptoms, follow your allergy action plan, stay with someone if possible, and watch closely for changes. Seek prompt medical advice if you have no plan, this is your first reaction, or facial swelling is increasing.
  8. Follow the instructions from the 911 dispatcher and emergency responders. With throat, breathing, faintness, or rapidly increasing swelling symptoms, emergency assessment remains appropriate even if epinephrine helps.

What can wait

Identifying the exact allergen, photographing the rash, checking every ingredient, arranging allergy testing, replacing used epinephrine, and planning future avoidance can wait until the immediate reaction has been assessed. You do not need proof that this is anaphylaxis before using prescribed epinephrine or calling 911 for severe symptoms.

Important reassurance

Uncertainty is common during an allergic reaction. Acting promptly on throat tightness, hoarseness, breathing or swallowing difficulty, faintness, or rapidly increasing mouth or facial swelling is appropriate.

Scope note

This guide covers immediate first steps only. Later decisions, including testing, replacement prescriptions, and a personalized allergy action plan, may require a clinician or allergy specialist.

Important note

This is general medical information, not medical advice or a diagnosis. Call 911 for throat tightness, hoarseness, breathing or swallowing difficulty, faintness, or rapidly increasing mouth, tongue, or facial swelling after a possible allergen.

Additional Resources

Closely connected guides that may be useful during the same situation or its immediate aftermath.

About this guide

This guide was produced and is maintained by PanicStation.org using its published editorial process. Official and specialist sources are checked where relevant, and AI-assisted tools may be used for drafting, organisation, and consistency checks. The site operator remains responsible for publication, revision, and removal decisions.

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