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.
Cold urticaria signs and symptoms may include:
Severe reactions may include:
Cold urticaria symptoms begin soon after the skin is exposed to a sudden drop in air temperature or to cold water. Damp and windy conditions may make a flare of symptoms more likely. Each episode may persist for about two hours.
The worst reactions generally occur with full skin exposure, such as swimming in cold water. Such a reaction could lead to loss of consciousness and drowning.
If you have skin reactions after cold exposure, see your doctor. Even if the reactions are mild, your doctor will want to rule out underlying conditions that may be causing the problem.
Seek emergency care if after sudden exposure to cold you experience a whole-body response (anaphylaxis) or difficulty breathing.
No one knows exactly what causes cold urticaria. Certain people appear to have very sensitive skin cells, due to an inherited trait, a virus or an illness. In the most common forms of this condition, cold triggers the release of histamine and other chemicals into the bloodstream. These chemicals cause redness, itching and sometimes a whole-body (systemic) reaction.
You're more likely to have this condition if:
The main possible complication of cold urticaria is a severe reaction that occurs after exposing large areas of skin to cold, for example, by swimming in cold water.
The following tips may help prevent a recurrent episode of cold urticaria:
Cold urticaria can be diagnosed by placing an ice cube on the skin for five minutes. If you have cold urticaria, a raised, red bump (hive) will form a few minutes after the ice cube is removed.
In some cases, cold urticaria is caused by an underlying condition that affects the immune system, such as an infection or cancer. If your doctor suspects you have an underlying condition, you may need blood tests or other tests.
In some people, cold urticaria goes away on its own after weeks or months. In others, it lasts longer. There is no cure for the condition, but treatment and preventive steps can help.
Your doctor may recommend you try to prevent or reduce symptoms with home remedies, such as using over-the-counter antihistamines and avoiding cold exposure. If that doesn't help, you may need prescription medication.
Prescription medications used to treat cold urticaria include:
If you have cold urticaria because of an underlying health problem, you may need medications or other treatment for that condition as well. If you have a history of systemic reaction, your doctor may prescribe an epinephrine autoinjector that you'll need to carry with you.
Antihistamines block the symptom-producing release of histamine. They can be used to treat mild symptoms of cold urticaria or to prevent a reaction. Over-the-counter (nonprescription) products include loratadine (Claritin) and cetirizine (Zyrtec).
You'll probably first visit your primary care doctor. He or she may then refer you to a doctor who specializes in skin diseases (dermatologist) or to an allergy specialist (allergist-immunologist).
Preparing a list of questions for your doctor will help you make the most of your time together. For cold urticaria, some basic questions to ask include:
Your doctor is likely to ask you questions such as:
If you're experiencing mild hives, these tips may help relieve your symptoms:
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