Hives During or After a Workout
Exercise-induced urticaria describes hives that appear during or soon after physical activity. It can range from mild itching to a serious allergic reaction, so it is important to learn which type you have and to exercise safely.
Three Conditions That Look Alike
| Condition | Key features |
|---|---|
| Cholinergic urticaria | Tiny welts triggered by rising body heat. See cholinergic urticaria. |
| Exercise-induced urticaria | Larger welts with exertion, sometimes with swelling. |
| Exercise-induced anaphylaxis | Hives plus breathing trouble, low blood pressure or collapse. |
Food-Dependent Exercise Reactions
In some people, reactions happen only if exercise follows a particular food, such as wheat or shellfish, or after taking an NSAID. An allergist can help identify this pattern.
Exercising Safely
- Exercise with a partner and stop at the first sign of itching or flushing.
- Avoid trigger foods and NSAIDs before workouts if advised.
- Carry an epinephrine auto-injector if prescribed.
- Warm up gradually and keep cool.
See our guide to allergic reaction hives.
Treatment
Daily non-sedating antihistamines can reduce milder reactions. Your doctor will decide whether further testing or emergency medication is needed. Read about overall urticaria treatment.
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. Patients with exercise-induced urticaria can book an online or in-person consultation at Dr. Tiffany Young’s Hives Treatment Center in San Francisco.
Frequently Asked Questions About Exercise-Induced Urticaria
Can I keep exercising?
Many people can with the right precautions and medical guidance.
Why do I get hives only sometimes?
Reactions may depend on food, medicine, temperature and stress on a given day.
Is it an emergency?
Breathing trouble, throat tightness or faintness is an emergency.
Get Relief for Your Hives
A diagnosis helps you stay active without risk. 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.
