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What to do if…
you get a bite or sting and the swelling keeps increasing over hours

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

Short answer

Call 911 now if you have trouble breathing, throat tightness, faintness, collapse, widespread hives, or swelling of the lips, tongue, face, mouth, or throat. If swelling keeps increasing over hours but you do not have those emergency symptoms, get same-day medical advice, especially if it is spreading quickly, very painful, hot, near the eye or mouth, or you feel sick.

Do not do these things

  • Do not ignore breathing trouble, throat tightness, faintness, collapse, widespread hives, or swelling of the lips, tongue, face, mouth, or throat.
  • Do not cut, squeeze, scratch open, or dig into the bite or sting site.
  • Do not use a tourniquet or tightly wrap the limb.
  • Do not leave rings, watches, tight shoes, or tight clothing on a swelling hand, foot, arm, or leg.
  • Do not exceed label doses of antihistamines, pain medicines, or creams.
  • Do not apply heat, burning remedies, harsh chemicals, or irritating home remedies.

What to do now

  1. Check for emergency allergy symptoms first. Call 911 now if you have trouble breathing, wheezing, throat tightness, trouble swallowing, swelling of the tongue, lips, face, mouth, or throat, widespread hives away from the sting, severe dizziness, fainting, collapse, or you suddenly feel very unwell.

  2. If anaphylaxis is possible and you have an epinephrine auto-injector, use it now. Use it as directed on the device or by your prescriber, then call 911. Tell the dispatcher if symptoms continue or worsen and whether you have a second auto-injector.

  3. Get into a safer position while help is coming. If you feel faint or dizzy, lie down and raise your legs if you can. Sit up if breathing is easier that way. Do not lie flat if you are vomiting, struggling to breathe, or it feels unsafe.

  4. Remove tight items before swelling increases more. Take off rings, watches, bracelets, tight clothing, tight socks, and shoes on the affected limb.

  5. Clean and cool the area. Wash the bite or sting site with soap and water. Use a cold compress or ice wrapped in cloth for short periods to reduce pain and swelling.

  6. If a visible stinger is still in the skin, remove it promptly. Scrape it out with a fingernail or the edge of a card if you can do that easily. Avoid squeezing the venom sac.

  7. Track whether the swelling or redness is spreading. Outline the edge with a pen and write the time next to it. Take a photo. Bring this information if you go to urgent care or the ER.

  8. Use over-the-counter relief only if it is safe for you. An oral antihistamine may help itching and some swelling. An over-the-counter pain reliever may help pain. Hydrocortisone cream may help itching or swelling at the skin surface. Follow the label and avoid anything you have been told not to take.

  9. Get urgent medical attention now if infection or cellulitis is possible. Go to urgent care or the ER if the red or swollen area is spreading quickly, the skin is hot and increasingly painful, or you develop fever or chills.

  10. Get same-day medical advice if swelling keeps increasing over hours. This matters more if the swelling is near the eye, mouth, or throat; you had many stings; you have had severe reactions before; the area is becoming hot or much more painful; or you feel generally unwell.

  11. Use Poison Control if you are unsure what bit or stung you. In the U.S., call Poison Help at 1-800-222-1222 for real-time guidance. Call 911 instead for life-threatening symptoms.

What can wait

  • You do not need to identify the exact insect or spider right now.
  • You do not need to decide today whether you have a long-term allergy.
  • You do not need to decide about allergy testing or prevention planning right now.
  • You do not need to keep touching, squeezing, or testing the swelling; use the pen line and photo instead.
  • You do not need to search for rare causes before you have checked the emergency symptoms and swelling pattern.

Important reassurance

Many bites and stings cause redness, itching, pain, and swelling. Some sting reactions can look alarming and keep swelling into the next day or two. You are not overreacting by getting help when swelling is still increasing, especially if it is spreading quickly, near the eye or mouth, very painful, hot, or you feel sick.

Scope note

These are first steps for the next few hours only. Later decisions about follow-up care, allergy evaluation, infection treatment, or prevention may need a clinician or another qualified specialist.

Important note

This is general information, not a diagnosis or medical advice. It is not a substitute for emergency care or advice from a qualified professional. If symptoms are worsening or you are unsure, seek same-day medical advice, and call 911 for emergency symptoms.

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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