When should I go to the emergency room (ER) for an allergic reaction?

A Answers (8)

  • You should call 9-1-1 and come immediately to the emergency room for an allergic reaction if at any time you have trouble breathing or experience any other worrisome symptoms. Allergic reactions can become life threatening if not treated properly. 
  • Allergic reactions vary by severity and how they look. You may have a rash only in a small area, which gets better with over-the-counter (OTC) medication. You may not need an emergency room (ER) visit.
    Another allergic reaction – called anaphylactic reaction – may be life threatening and requires prompt treatment. Go to the ER immediately if you have:
    • shortness of breath
    • swelling to lips or tongue
    • a feeling that your throat is closing 
    You should also go to the ER if you have an unknown rash and severe itching and have tried OTC medication without relief. Allergic reactions may start mild and get worse. It’s always important to monitor your symptoms. If you have any concerns, doctors are always available to treat you in the emergency room.
  • When should I go to the emergency room (ER) for an allergic reaction?
    You should go to the emergency room (ER) for an allergic reaction right away if any of the following symptoms are present:
    • a rash, such as hives
    • nausea and vomiting
    • swelling of the eyes
    • swelling of the mouth and the throat, which can eventually cause your airway to close off
    Allergic reactions can come on rapidly and without much warning. They can also be life-threatening, whether it's caused by a bee sting, an ant bite, a peanut or even a strawberry. Various things can cause allergic reactions that can be quite serious.

    Learn more from Gan Su, DO, with Medical City Healthcare, in this video.
  • Allergic reactions should be taken seriously. We recommend being seen by a doctor for any allergic reactions that concern you. Symptoms that should prompt an immediate emergency room visit include any difficulty breathing, swelling of the throat or mouth, difficulty swallowing and lightheadedness. Other significant reactions include rash, diarrhea, abdominal pain and itching.
  • A Emergency Medicine, answered on behalf of
    When Should I Go to the Emergency Room for an Allergic Reaction?
    Red flag symptoms for allergic reactions include shortness of breath, abdominal pain, rash and more, says Michael Dodd, MD, from Frankfort Regional Medical Center. Find out what other signs should send you to the ER in this video.
  • A Emergency Medicine, answered on behalf of
    When Should I Go to the ER if I Have an Allergic Reaction?
    If you have an allergic reaction, would you know if a trip to the emergency room is warranted? In this video, emergency medicine physician, David Feldman, MD, of Good Samaritan Hospital, offers pointers for making that decision. 
  • If you have an allergic reaction, call 911 or go to the hospital emergency room for:
    • Swelling of the face or throat
    • Trouble swallowing
    • Trouble breathing
    • Being dizzy or passing out
    • Coughing and vomiting
    These are signs of a dangerous allergic reaction. Get medical help right away!

    Call or go to the doctor or clinic if:
    • Your whole body has reacted strongly to a bite or sting (bee, wasp, hornet, fire ant, and so on)
    • Your body has had a bad reaction to food or medicine
  • A Allergy & Immunology, answered on behalf of
    Any severe allergic reaction that compromises breathing or the heart should be immediately transported to the emergency room. If the patient has injectable epinephrine at home and knows how to use this, that should be injected. The patient then should be taken to the emergency room. Other reactions such as severe hives, swelling, gastrointestinal problems that do not respond to medications should also should be transported to the emergency room.
This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.
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