Hives are generally harmless, so although exercising with might may be uncomfortable, it usually does not need to be avoided for safety reasons. However, a severe allergic reaction, particularly if triggered by exercise, can be deadly. Consult with your doctor before exercising with hives.
Identification
Hives can occur anywhere on the body as smooth red welts. These welts can vary in size and shape. Hives are often itchy or have a burning sensation. Most will disappear within two to four hours, but they can reappear just as quickly. If you press on a hive, it will turn white for a few seconds. If you experience widespread swelling, this is called angioedema. Angioedema can be life-threatening since your throat and tongue may swell, MayoClinic.com warns, and you should not be exercising if you're experiencing swelling.
Cause
Hives are caused by an immune response within your skin. During the sensitization process of developing an allergy, your immune system detects a usually harmless substance as being harmful and begins producing antibodies to fight the substance in the future. This substance is called an allergen. The next time the allergen is present, you will experience hives as a result of histamines and other chemicals being released into your bloodstream. You may never know what triggered your hives, but some triggers include exercise, excessive sweating, heat, sun exposure, certain medications, bug bites and pollen.
Treatment
Antihistamines can usually help reduce and prevent hives from occurring. Whether or not you have to stop exercising depends on the cause and severity of your hives. Avoid taking hot showers or baths while you have hives, since hot temperatures can worsen your condition. Wear loose cotton clothing until your hives disappear. If you exercise with hives, stay in an air-conditioned environment and listen to your body. If you experience difficulties breathing from your tongue swelling, throat tightening or notice wheezing, stop exercising immediately and seek emergency medical attention. An emergency allergic reaction that causes hives in the back of the throat or swelling can be treated with a shot of epinephrine.
Prevention
If you know what triggers your hives, avoid the substance as much as possible. If you get hives from exercising, heat or any trigger that would be present while exercising, always exercise with a partner who knows your condition. Antihistamines or prescribed medications taken prior to exercise can prevent allergy symptoms from occurring. Avoid vigorous aerobic activity, since this may trigger hives due to an elevated body temperature and sweating.
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