Temperature-Related Hives

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Temperature-Related Hives

Question:

I break out in hives when I get too cold. The hives go away once I become warm again. This can happen in the winter months or in the summer when the air conditioning is on. Is this some kind of imbalance? Is there anything I can do?

Answer:

Hives ("urticaria") appear as pink, raised areas on the skin. They can be very itchy. There are many causes of hives, including medications, infections, foods, medical conditions, and allergies to dust, mold, chemicals or other substances. Stress, exercise, and pregnancy can also cause hives.

In addition to allergic reactions causing hives, there are certain physical factors that can cause them, such as cold ("cold urticaria"), sunlight ("solar urticaria"), exercise ("cholinergic urticaria"), and water ("aquagenic urticaria"). Swimming in cold water or snow skiing may cause cold urticaria with dizziness and fainting, so be sure someone accompanies you on such activities.

Avoiding the cause of hives, if possible, is important. Antihistamines can also help. See a doctor if the hives continue or if you don't know what is causing them. Prescription corticosteroids, such as prednisone, may be necessary in some severe cases.

If you have trouble breathing, get medical help right away.

Rebecca Campen, M.D., J.D. is an Assistant Professor of Dermatology at Harvard Medical School. She divides her time between clinical practice of dermatology at the Massachusetts General Hospital and private practice in Savannah, Ga.

Last updated:	July 20, 2009