Cold urticaria (ur-tih-KAR-e-uh) is a skin reaction to cold that appears within minutes after cold exposure. Affected skin develops reddish, itchy welts (hives).

People with cold urticaria experience widely different symptoms. Some have minor reactions to the cold, while others have severe reactions. For some people with this condition, swimming in cold water could lead to very low blood pressure, fainting or shock.

Cold urticaria occurs most frequently in young adults. If you think you have this condition, consult your doctor. Treatment usually includes preventive steps such as taking antihistamines and avoiding cold air and water.

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