Cold urticaria is a rare allergic-like condition where your body reacts to cold temperatures with hives and swelling. From stepping outside on a chilly day to sipping an iced drink, everyday exposures to cold can trigger uncomfortable and sometimes serious reactions in people living with this unusual disorder.
Understanding Cold Urticaria
Cold urticaria is a condition that causes your body to have an allergic reaction when exposed to cold temperatures. This isn’t just about feeling uncomfortable in winter weather. For people with this condition, contact with cold air, water, food, or objects can trigger visible and sometimes severe physical reactions. The condition can affect anyone, though it remains relatively uncommon in the general population.[1]
There are two main types of cold urticaria. Acquired cold urticaria, also called essential cold urticaria, is the more common form and occurs in people with no family history of the disease. Symptoms typically appear within a few minutes after cold exposure and usually go away within an hour or two. Familial cold urticaria, also known as hereditary cold urticaria, is passed down through families. This type takes longer to show symptoms, sometimes appearing anywhere from 30 minutes to 48 hours after exposure, and the reactions can last a day or two.[1]
How Common Is Cold Urticaria?
Cold urticaria is considered a rare disorder, with the familial form being especially uncommon. Research suggests that cold urticaria affects approximately 0.05% of the global population, which means about 5 in every 10,000 people live with this condition.[12] Among people who have chronic urticaria in general, studies have found that cold urticaria accounts for approximately 8% to 26% of cases. Interestingly, cold urticaria appears more likely to occur alongside another type of chronic urticaria rather than existing on its own.[22]
Physical urticaria, the broader category that includes cold urticaria, accounts for about 25% of all chronic urticaria cases. Within this group, between 6% and 34% of individuals have cold urticaria specifically.[8] The condition is more commonly diagnosed in areas with colder climates, which makes sense given the increased exposure to cold temperatures in these regions.[8]
Cold urticaria occurs most often in young adults, typically appearing between ages 20 and 30, though the age range is quite broad, spanning from as young as 3 months to as old as 74 years. In studies that included both children and adults, the median age of onset was between 22 and 27 years old. In studies focusing on pediatric patients, the median age of onset was between 8 and 8.5 years old.[8][22] Research shows that the condition affects both men and women at approximately the same frequency, though some studies suggest it may be slightly more common in women.[8][12]
What Causes Cold Urticaria?
The exact cause of cold urticaria remains unknown in most cases. What doctors do know is that when someone with this condition is exposed to cold, their body releases histamines in reaction. Histamines are chemicals made by your immune system in response to what it perceives as a threat or allergen. However, why the body decides to release histamines in response to cold temperatures is still not fully understood.[1]
In acquired cold urticaria, the cause is typically idiopathic, which is a medical term meaning the origin is unknown. You could have sensitive skin cells due to a virus, an illness, or from inherited traits, though no single explanation fits all cases.[6] Some research suggests that cold urticaria may be related to autoimmune disorders in certain cases. Autoimmune disorders involve your body’s immune system mistakenly attacking healthy cells or tissues for unknown reasons.[1]
The condition is sometimes associated with underlying health problems. These can include blood disorders such as cryoglobulinemia, which is a condition where certain proteins in the blood react abnormally to cold. Cold urticaria has also been linked to certain types of blood cancers, including chronic lymphocytic leukemia and lymphosarcoma, which is cancer in the lymphatic system. Viral infections such as mononucleosis, chickenpox, and viral hepatitis have also been associated with cold urticaria, as have other infectious diseases like syphilis.[1][12]
Who Is at Risk?
Cold urticaria can affect anyone regardless of age, gender, or background. Although the disorder is sometimes inherited, most cases occur in people with no family history of the disease.[1] However, certain factors can increase the likelihood of developing this condition.
Age plays a role in cold urticaria risk. Young adults between the ages of 18 and 30 are most commonly diagnosed with the acquired form of the condition, though it can develop at any point in life from infancy through old age.[4] Children can also develop cold urticaria, with some cases appearing as early as 5 years old.[2]
Having certain underlying medical conditions increases your risk of developing secondary cold urticaria. People with blood disorders like cryoglobulinemia or certain types of cancer are at higher risk. Viral infections, particularly hepatitis and mononucleosis, can also increase the chances of developing cold urticaria. In rare cases, having a close family member with the condition means you may inherit the familial form, though this type of cold urticaria is extremely rare.[4]
Living in colder climates or environments where you’re frequently exposed to cold temperatures may make you more likely to notice symptoms, though it doesn’t necessarily increase your risk of developing the condition itself. The condition is also commonly associated with other types of physical urticaria, such as dermographism (where skin welts appear after being scratched or rubbed) and cholinergic urticaria (where hives appear in response to sweating or heat).[12]
Symptoms and How They Affect Daily Life
The symptoms of cold urticaria can range from mild to severe, and they vary significantly from person to person. Some people experience minor reactions affecting only a small area of skin, while others develop reactions that cover their entire body.[1]
The main symptom is a skin rash that appears after exposure to something cold. The rash typically develops not during the cold exposure itself, but afterward, as your skin’s temperature rises and begins to warm up again. This reaction usually starts within 2 to 5 minutes after exposure and can last for about 1 to 2 hours.[12] The timing can be slightly different depending on which type of cold urticaria you have. In acquired cold urticaria, symptoms typically appear within a few minutes, while in familial cold urticaria, symptoms may take 30 minutes to 48 hours to develop.[1]
The skin reaction itself can include several features. Most commonly, people develop hives, which are raised bumps or welts on the skin. These are typically red in color and intensely itchy. The affected skin may also become swollen and may have a burning sensation. All of these reactions occur on the parts of the body that were exposed to cold.[1]
Beyond the skin reactions, people with cold urticaria may experience additional symptoms. These can include fatigue, fever, headache, and joint pain. When you hold cold objects, your hands may swell significantly. Eating cold food or drinking cold beverages can cause your lips to swell, and some people experience swelling inside the mouth and throat, which can make swallowing difficult.[1][2]
In rare but serious cases, cold urticaria can trigger a systemic reaction that affects the entire body. These severe reactions are more likely to occur when large areas of the body are exposed to cold all at once, such as when swimming in cold water. Systemic symptoms can include shortness of breath or wheezing, fainting, heart palpitations (feeling like your heart is racing or pounding), swelling of the tongue and throat that makes breathing difficult, and in the most severe cases, anaphylaxis, which is a massive allergic reaction that can be life-threatening.[1][2]
The worst reactions generally occur when all or most of the skin is exposed to cold at once. Swimming in cold water is particularly dangerous because it exposes the entire body suddenly. These severe reactions could lead to a drop in blood pressure, fainting while in the water, and potentially drowning. Each episode of symptoms typically lasts about two hours, though this can vary.[2]
Common triggers that can cause symptoms include stepping outside in cold weather, swimming or bathing in cold water, eating or drinking something cold, putting ice on your skin, holding cold objects, and even exposure to air conditioning. Some people react to cold rain or wind, while others may develop symptoms simply from washing their hands in water that isn’t warm enough. Damp and windy conditions tend to make symptoms worse.[1][2]
Research shows that among patients with cold urticaria, the most common trigger was exposure to cold water, affecting 63% to 92% of patients. Cold air or weather triggered reactions in 58% to 82% of people. Contact with cold surfaces or objects caused symptoms in as many as 73% of patients, while ingestion of cold food or beverages triggered hives in up to 20% of people. More than 44% of patients were triggered by localized exposure to cold fluid, such as during handwashing.[22]
How to Prevent Cold Urticaria Reactions
While there’s no way to prevent cold urticaria from developing in the first place, there are many steps you can take to avoid triggering reactions once you have the condition. The most effective prevention strategy is simply staying warm and avoiding exposure to cold whenever possible.[5]
Protecting yourself from cold weather is essential. This means dressing in layers year-round, not just in winter. Even in summer, you may need extra clothing when entering air-conditioned buildings or rooms. Wearing scarves, gloves, thermal socks, and warm clothing helps protect your skin from cold air. Some people find it helpful to use pocket hand warmers or other portable heating devices. When going outside in cold weather, covering as much skin as possible reduces the risk of a reaction.[8]
Avoiding cold water is equally important. Before swimming, check the water temperature. If you do enter cold water, do so gradually and never alone. Having someone nearby who knows about your condition and can help in an emergency is crucial. Some people with cold urticaria need to avoid swimming in natural bodies of water altogether, as the combination of cold water and full-body immersion creates the highest risk for severe reactions.[22]
Managing food and drink temperatures requires attention to detail. Avoid consuming cold foods and beverages, even in summer. Let refrigerated items sit at room temperature before eating or drinking them. Some people find that warming cold foods slightly or drinking only warm or room-temperature beverages prevents mouth and throat swelling. Avoiding ice cream, cold cheese, yogurt, and raw vegetables straight from the refrigerator can help prevent internal reactions.[8]
Making changes to your indoor environment can reduce exposure. Using a space heater in your office or home helps maintain a comfortable temperature. Avoid sitting near air conditioning vents or in drafty areas. If you work in an environment where you can’t control the temperature, bringing extra layers or a personal heating device may help. Some people with cold urticaria need to specifically request warmer meeting spaces or work areas.[8]
Taking preventive medication before planned cold exposure can be helpful. If you know you’re going to be exposed to cold, taking an antihistamine beforehand may help reduce or prevent a reaction. This approach works best when you can anticipate the exposure, such as before going outside in winter or before a necessary medical procedure in a cold environment.[9]
Planning ahead is key to prevention. Check weather forecasts, including wind chill factors, before going out. Schedule outdoor activities during warmer parts of the day when possible. If you travel, research the climate of your destination and pack accordingly. Keep emergency supplies like warm clothing, gloves, and scarves in your car in case of unexpected exposure.[8]
How the Body Changes with Cold Urticaria
Understanding what happens inside your body when cold urticaria is triggered helps explain why the symptoms occur. At the cellular level, exposure to cold causes your body to activate certain immune system cells called mast cells. These cells are part of your body’s defense system and are found throughout your skin and other tissues.[12]
When you have cold urticaria and are exposed to cold, your mast cells become activated and begin releasing chemicals, particularly histamine, into the surrounding tissues. Histamine is a powerful chemical that causes blood vessels to expand and become more permeable, allowing fluid to leak out into surrounding tissues. This process leads to the characteristic symptoms of hives and swelling.[1]
The release of histamine causes several physical changes in your body. Blood vessels in the affected area dilate, or widen, which brings more blood to the area and causes the red color of hives. The increased blood flow also generates heat, which is why the affected skin often feels warm to the touch. At the same time, fluid leaks from the blood vessels into the surrounding tissue, creating the raised, swollen appearance of welts and hives. Nerve endings in the area become irritated by the histamine and other chemicals, which creates the intense itching sensation.[1]
Why mast cells in people with cold urticaria react to cold when they shouldn’t remains unclear. In a normal immune response, mast cells release histamine when they encounter something truly harmful, like bacteria or toxins. In cold urticaria, the immune system mistakenly identifies cold as a threat and responds accordingly. This is why cold urticaria is sometimes described as an autoimmune disorder, though it may not fit the classic definition in all cases.[1]
The timing of when symptoms appear relates to the rewarming process. Interestingly, symptoms typically develop not during the cold exposure itself, but as the skin begins to rewarm afterward. As your skin temperature rises, the mast cells become even more active, releasing more histamine and causing the visible symptoms to appear. This is why someone might step out of a cold pool feeling fine, only to break out in hives several minutes later as they dry off and warm up.[1]
In severe cases involving systemic reactions, the release of histamine isn’t limited to just the skin. When large areas of the body are exposed to cold at once, mast cells throughout the body can be triggered, releasing histamine into the bloodstream. This widespread histamine release can affect the cardiovascular system, causing blood vessels throughout the body to dilate and blood pressure to drop. It can affect the respiratory system, causing airways to constrict and making breathing difficult. This is the mechanism behind anaphylaxis, the most severe form of allergic reaction.[2]
The mean duration of cold urticaria is approximately 4.8 to 9.3 years, with about 50% of people seeing improvement within approximately 5 years. Research indicates that about 14% of adult patients experience complete resolution of their cold urticaria at 5 years, and 43% have resolution at 10 years. This suggests that while cold urticaria can be long-lasting, it may eventually resolve on its own in many cases.[8][22]
