How Dangerous Are Hives? When Hives Are Harmless and When They Are Not
Most hives are not dangerous. They are itchy and uncomfortable, but they fade without lasting harm. The risk comes from what may accompany hives, especially signs of a body-wide allergic reaction called anaphylaxis.
When Hives Are Usually Harmless
Hives that appear alone, without swelling of the face or throat and without trouble breathing, are usually harmless. Most acute episodes resolve within days. See acute urticaria.
Warning Signs That Need Emergency Care
- Difficulty breathing or wheezing
- Swelling of the tongue, lips or throat
- Dizziness or fainting
- Rapid heartbeat
- Repeated vomiting or severe cramps
Other Concerns
Chronic hives can hurt sleep, mood and quality of life, even when they are not dangerous. Hives that last longer than a day and leave bruises may signal vasculitis. See lupus hives.
What to Do
If symptoms are mild, take an antihistamine and monitor. If they are severe or worsening, seek emergency help. Read about severe hives.
When to Call 911
Call 911 right away if hives or swelling occur with difficulty breathing or swallowing, a tight or closing throat, a swollen tongue, lips or face, wheezing, faintness, or a sudden feeling of impending doom. Use an epinephrine auto-injector first if one has been prescribed to you, then call for emergency help.
When to See a Doctor
See a doctor if your symptoms last more than a few days, keep coming back, cover large areas, or interfere with sleep or daily life. Dr. Tiffany Young’s Hives Treatment Center in San Francisco offers online and in-person consultations for patients with hives.
Frequently Asked Questions About Are Hives Dangerous?
Can hives kill you?
Hives alone do not, but anaphylaxis can be fatal without prompt treatment.
Are hives a sign of something serious?
Rarely. Most have no serious underlying disease.
Are chronic hives dangerous?
They are not life-threatening, though they can be very disruptive.
Get Relief for Your Hives
Even harmless hives are worth treating so you can feel normal again. Visit our hives treatment page to see the latest treatment options for your outbreak.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis or treatment. If you think you are having a medical emergency, call 911.
