Cold urticaria signs and symptoms include:
- Temporary reddish, itchy welts (hives) on the area of skin that was exposed to cold
- A worsening of the reaction as the skin warms
- Swelling of hands when holding cold objects
- Swelling of lips and throat when consuming cold food or drink
Severe reactions may include:
- A whole-body response (anaphylaxis), which can cause fainting, a racing heart, swelling of limbs or torso, and shock
- Swelling of the tongue and throat, which can make it difficult to breathe
Cold urticaria symptoms begin soon after the skin is exposed to a sudden drop in air temperature or to cold water. The majority of cold urticaria reactions occur when skin is exposed to temperatures lower than 39 F (4 C). But some people can have reactions to warmer temperatures. Damp and windy conditions may make cold urticaria more likely.
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.
In some people, cold urticaria goes away on its own after weeks or months. In others, it lasts longer.
When to see a doctor
If you have skin reactions after cold exposure, see a 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:
- Feel dizzy
- Have trouble breathing
- Feel your tongue or throat swelling
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 your bloodstream. These chemicals cause redness, itching and sometimes a whole-body (systemic) reaction.
Anyone can develop cold urticaria. You're more likely to have this condition if:
- You're a child or a young adult. The most common type — primary acquired cold urticaria — occurs in children and young adults. It usually improves on its own within a few years.
- You recently had an infection. For example, pneumonia has been linked to cold urticaria.
- You have an underlying health condition. A less common type — secondary acquired cold urticaria — can be caused by an underlying health problem, such as hepatitis or cancer.
- You have certain inherited traits. Rarely, cold urticaria is inherited. This familial type causes painful welts and flu-like symptoms after exposure to cold.
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.
You can help prevent a recurrent episode of cold urticaria with these practices:
- Take an over-the-counter antihistamine before cold exposure.
- Take medications as prescribed.
- Protect your skin from the cold or sudden changes in temperature. For example, wear a wetsuit when swimming in cold water. Some people have had success with this method, but it isn't proved.
- Avoid ice-cold drinks and food to prevent swelling of your throat.
- If your doctor prescribed an epinephrine autoinjector (Epipen, Auvi-Q, others), keep it with you to help prevent serious reactions.
- If you're scheduled for surgery, talk with your surgeon beforehand about your cold urticaria. The surgical team can take steps to help prevent cold-induced symptoms in the operating room.