Hives are often associated with allergies, but in some people, they appear only after exposure to physical triggers such as temperature. These reactions are known as chronic inducible urticaria, sometimes referred to as physical urticaria.
According to Niha Qamar, MD, an adult and pediatric allergy, asthma, and immunology specialist at our Fresh Meadows, New York office, temperature-related hives occur when the skin reacts to heat or cold with rapid inflammation.
While these conditions are not extremely common, they can significantly affect daily activities if left unmanaged. Understanding the causes, triggers, and treatment options can help patients recognize symptoms early and avoid potential complications.
Understanding Cold and Heat Urticaria
Cold urticaria and heat urticaria are both forms of chronic inducible urticaria, meaning hives are triggered by a specific physical stimulus rather than appearing randomly.
Cold urticaria occurs when the skin reacts to cold temperatures, while heat urticaria develops after exposure to heat. Cold urticaria is more common, while heat-induced urticaria is considered relatively rare. Overall, chronic inducible urticaria affects about 1 in 200 people.1
Symptoms typically appear within minutes of exposure and may include raised, itchy welts, redness, and swelling at the site of contact. In most cases, these hives resolve within a few hours once the trigger is removed.²,³
What Triggers Temperature-Induced Hives?
Temperature urticaria can occur when the skin is exposed to a variety of hot or cold stimuli. Triggers are not limited to weather conditions alone.
Common triggers may include exposure to cold or warm air, contact with water such as swimming pools, lakes, or oceans, liquids touching the skin, or direct contact with cold or hot objects.
These reactions occur when temperature exposure triggers the release of histamine and other inflammatory chemicals in the skin, leading to the development of hives.
Air, Water, or Both?
Not everyone with temperature-induced urticaria reacts to the same triggers. Some individuals may experience symptoms with multiple forms of exposure, while others may only react in specific situations.
For example, someone may develop hives when walking outside in cold weather, washing their hands in cold water, holding hot objects, or swimming in cold water.
Cold water exposure can be particularly concerning because it exposes a large surface area of skin at once, which can increase the risk of a more severe reaction.
Who Is Most at Risk?
Researchers are still working to understand why some people develop temperature-induced urticaria while others do not. However, there is a known association between chronic urticaria and autoimmune diseases.
Conditions that have been linked with chronic urticaria include thyroid disorders, celiac disease, Sjögren’s disease, systemic lupus erythematosus, rheumatoid arthritis, and type 1 diabetes.
For many patients, cold urticaria improves over time. Studies suggest that approximately 60 percent of individuals experience resolution within five to six years, although symptoms can persist longer in some cases.⁴
How Allergists Diagnose Cold and Heat Urticaria
Diagnosis usually begins with a detailed discussion of symptoms, including when hives appear and what may trigger them. In many cases, allergists can recognize temperature-induced urticaria based on a patient’s medical history.
Simple in-office tests may also be used to confirm the diagnosis.
One common method is the ice cube test, where a melting ice cube inside a thin plastic bag is placed on the skin for about five minutes. After the ice is removed, the skin is monitored for about ten minutes to see if a hive develops.²
For suspected heat urticaria, a heat contact test may be performed by placing a warm object on the skin for several minutes to see whether a hive forms afterward.
Managing and Treating Temperature-Induced Urticaria
Treatment typically focuses on avoiding triggers, controlling symptoms, and reducing the risk of severe reactions.
Identifying and avoiding temperature triggers is often the most effective management strategy. For individuals with cold urticaria, this may include avoiding swimming in uncontrolled cold water or limiting prolonged exposure to cold weather.
Antihistamines such as cetirizine, commonly known as Zyrtec, are often used to help control mild symptoms and prevent hive formation.³
If patients experience severe swelling or angioedema, physicians may prescribe short courses of corticosteroids to reduce inflammation.
For persistent or more severe cases, advanced therapies may be recommended. One example is anti-IgE treatment such as omalizumab, marketed as Xolair, which has proven effective for many patients with chronic urticaria.²
Important Safety Considerations
Cold urticaria can occasionally lead to more serious reactions, particularly when the body is suddenly exposed to cold water.
Swimming in cold water is considered a high-risk activity because it exposes a large portion of the body at once. In rare cases, this can trigger severe allergic reactions or even anaphylaxis.
Because of this risk, patients diagnosed with cold urticaria may be advised to carry an epinephrine auto-injector and discuss lifestyle precautions with their allergist.²
Frequently Asked Questions About Cold and Heat Urticaria
What is the difference between cold urticaria and heat urticaria?
Cold urticaria occurs when hives develop after exposure to cold temperatures, while heat urticaria occurs after contact with heat. Both conditions are forms of chronic inducible urticaria and cause raised, itchy hives that appear shortly after exposure to a trigger.
How quickly do symptoms appear after exposure?
Symptoms usually appear within minutes after exposure to cold or heat and typically resolve within a few hours once the trigger is removed.²,³
Can swimming trigger cold urticaria?
Yes. Swimming in cold water is one of the most common triggers. Because a large portion of the body is exposed at once, the reaction may be more severe.
Is cold urticaria dangerous?
Most cases cause localized hives and itching. However, sudden exposure to cold water can occasionally trigger severe reactions or anaphylaxis in rare cases.¹
Does cold urticaria go away?
In many cases, symptoms improve over time. About half of patients experience resolution within five to six years.⁴
What medications are used to treat temperature-induced hives?
Antihistamines such as cetirizine (Zyrtec) are commonly used for symptom control. In more persistent cases, treatments such as omalizumab (Xolair) may also be recommended.²
Schedule an Evaluation With an Allergist
If you experience hives after exposure to cold or heat, an evaluation by a qualified allergist can help identify triggers and develop a personalized care plan. The allergists at ENT & Allergy Associates specialize in diagnosing and managing chronic urticaria and other allergic conditions using evidence-based testing and treatment strategies.
With locations across New York, New Jersey, Pennsylvania, and Texas, patients can access expert care close to home. If temperature-related hives are affecting your daily life, schedule a consultation with an allergist at ENT & Allergy Associates to discuss testing, treatment options, and strategies to safely manage your symptoms.
Sources:
Muñoz M, Kiefer LA, Pereira MP, Bizjak M, Maurer M. New insights into chronic inducible urticaria. Curr Allergy Asthma Rep. 2024 Aug;24(8):457-469. doi:10.1007/s11882-024-01160-y. PMID: 39028396; PMCID: PMC11297124.
WebMD. What Is Cold Urticaria?.
WebMD. Cholinergic Urticaria.
Sánchez J, Álvarez L, Cardona R. Prospective analysis of clinical evolution in chronic urticaria: Persistence, remission, recurrence, and pruritus alone. World Allergy Organ J. 2022 Oct 8;15(10):100705. doi:10.1016/j.waojou.2022.100705. PMID: 36267098; PMCID: PMC9554810.