Chronic hives, also called chronic urticaria, is a long-lasting, serious condition marked by recurring episodes of itchy hives and/or deep tissue swelling that can unpredictably flare and subside over time for more than six weeks and may continue for months or even years.1,2 

  • Who gets them? Chronic hives affect approximately 5% of the United States population, with women being twice as likely to be affected as men.2,3  
  • Where do they happen? Chronic hives can show up anywhere on the body. They are sometimes accompanied by angioedema, which is the swelling of the lips, eyelids, hands, feet, and other areas.2 
  • Why do they happen? Chronic hives is thought to be linked to an overactive immune system. It can also be triggered by external factors such as scratching, cold, heat, and sweat.4 

There are two main types of chronic hives:  

  • Chronic spontaneous urticaria (CSU): Hives that occur with no known external trigger.1
  • Chronic inducible urticaria (CIndU): Hives caused by a specific trigger, such as heat, cold, exercise, or scratching.1

Here you'll find information on the common types of chronic hives, how to navigate symptoms and diagnosis, and how to find support. 

What is Chronic Hives (Chronic Urticaria)?

Chronic hives (chronic urticaria) is a serious, long-lasting condition.1 People with chronic hives experience recurring symptoms such as itchy hives, and/or deep tissue swelling (angioedema) persisting for six weeks or longer.1 Individuals with chronic hives may also experience burning, stinging, or pain in their skin. Chronic hives can also negatively affect daily life, including sleep disturbance and social anxiety.1

There are two main types of chronic hives: chronic spontaneous urticaria (CSU) and chronic inducible urticaria (CIndU).1 The difference between them is whether there is an identifiable external trigger (something that causes the hives to start). It is possible to have both CSU and CIndU at the same time, which can make it harder for doctors to diagnose.1,3

What Is Chronic Spontaneous Urticaria (CSU)?

CSU is the most common type of chronic hives and affects approximately 1.7 million people in the United States.3 CSU is different from other forms of hives because it is not caused by external triggers such as heat, cold, or allergens.1,2 While the exact cause of CSU is unknown, it's believed to be caused by an overactive immune system.4

What Is Chronic Inducible Urticaria (CIndU)?

CIndU is a type of chronic hives caused by an identifiable external trigger like pressure, sunlight, friction, heat, cold or water.1 In CIndU, hives typically appear within minutes after coming in contact with the trigger.1 Hives can last for a few minutes or for a few hours, and typically appear in the exact spot where the skin was triggered.1 This condition is different from a food or pollen allergy, which can affect the whole body. CIndU usually appears and stays in the affected area.1

Identifying triggers is a key part of managing the condition. There are several types of CIndU, but the three most common types are: 

  • Symptomatic Dermographism (SD): Sometimes called “skin writing,” SD occurs following light scratching, rubbing, or friction on the skin. For some people, even clothing seams, towels, or gentle pressure on the skin can trigger symptoms.5
  • Cold Urticaria (ColdU): ColdU occurs after skin exposure to cold temperatures, cold air, cold water or objects, leading to wheals or angioedema that develop within minutes after exposure and are usually limited to areas exposed to the cold.5
  • Cholinergic Urticaria (CholU): CholU is triggered by a rise in body temperature, such as during exercise, hot showers, stress or strong emotions. It often appears as clusters of small, itchy hives that develop shortly after the body begins to heat up.5


Other less common forms of CIndU can be triggered by things like sustained, heavy pressure on the body for a prolonged period, such as from manual labor or tight clothing (delayed pressure urticaria), exposure to direct heat (heat urticaria), or by coming into contact with certain substances like foods, latex, or chemicals (contact urticaria). Less common triggers also include sunlight (solar urticaria), contact with water (aquagenic urticaria), or continuous vibration exposure, like using a push-style lawnmower (vibratory urticaria).2,6

Because chronic hives symptoms can worsen over time, a doctor can help confirm a diagnosis, identify potential triggers, and discuss treatment options to help manage symptoms.2

How is Chronic Hives (Chronic Urticaria) Diagnosed?

Chronic hives is diagnosed through a thorough review of a person’s medical history and symptoms with their doctor. People may be referred to a specialist, such as a dermatologist or allergist, to help better understand what may be causing symptoms.2  

There’s no single definitive test for CSU. It is diagnosed by “ruling out” other problems first, meaning that a doctor will check to make sure symptoms aren’t being caused by other conditions.1 It can sometimes take more than 2 years to get a CSU diagnosis.7 During this time, many people go through lots of tests or make big lifestyle changes that do not bring relief.7 Even after being diagnosed with CSU, it is common to keep looking for an outside cause, even though the real problem is happening inside the body.8

If CIndU is suspected, a doctor may perform a procedure called a provocation or “trigger” test, where a small area of skin is safely exposed to a suspected trigger (like cold, heat, or pressure) to see if hives appear.6

Keeping track of symptoms, including when they happen and what may trigger them, can help you have more informed conversations with your doctor and better understand your condition.7

How is Chronic Hives (Chronic Urticaria) Treated?

Living with chronic hives can be both physically and emotionally exhausting. People can feel stuck in a cycle of dealing with flare-ups and settling for treatments that are just "good enough."7

Itching, painful swelling, and poor sleep can easily interfere with work, relationships, and daily routine. Many people living with chronic hives find themselves changing routines, avoiding certain situations, or constantly trying to identify and manage possible triggers in hopes of preventing flare-ups.6 Over time, these adjustments can be physically and emotionally exhausting and may significantly impact quality of life.1,7

Common Treatment Options:

  • Over-the-Counter Antihistamines (Allergy Pills): This is usually the first treatment doctors suggest. In some cases, doctors may direct patients to take up to 4 times the recommended dose.6
  • Steroids: For severe flare-ups, doctors might prescribe a short round of steroid pills to quickly bring down the swelling and reduce symptoms.7
  • Prescription Medicines: Sometimes, standard antihistamines aren't enough. In fact, more than half of people (over 50%) with chronic hives still experience symptoms even after taking high doses of antihistamines.3,7 For patients who need advanced treatment options, there are treatments approved by the FDA specifically for CSU.9


While living with chronic hives can feel challenging, patient resources, advocacy community support, and treatment options are available. Working closely with your doctor and connecting with trusted patient resources can help you better understand your condition and take steps toward managing symptoms more confidently. 

Kristen Willard, MS, Executive Director, We CU

Living with chronic hives can feel unpredictable and exhausting—but support, trusted information, and community can make the journey feel less overwhelming.

- Kristen Willard, MS,
 Executive Director, We CU

For more information about tracking your symptoms, check out the following resource: My Chronic Hives Journal

The Impact of Chronic Hives (Chronic Urticaria)

2-4
Years

Average time it takes to receive a formal diagnosis for chronic hives.⁷

2x
More Likely

Women are twice as likely to experience chronic hives compared to men. ³

30-50
Years Old

Age group most affected by chronic hives.²

Chronic Spontaneous vs. Inducible Urticaria: What Is the Difference?

  • Chronic Spontaneous vs. Inducible Urticaria: What Is the Difference? *Patient Portrayal View
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  • Chronic Spontaneous vs. Inducible Urticaria: What Is the Difference? * Patient portrayal View
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More About Chronic Hives (Chronic Urticaria)

Chronic urticaria (also commonly referred to as chronic hives) is not officially classified as an autoimmune disease, but the immune system is thought to play a key role.4

We don’t fully understand why, but it’s believed that chronic spontaneous urticaria (CSU) is caused by the body’s immune system becoming activated through allergic (IgE) or autoimmune (IgG) pathways, triggering the release of chemicals like histamine, leading to the red, swollen, and itchy hives commonly seen with this condition.4 

For patients with chronic inducible urticaria (CIndU), hives are triggered by external factors like temperature changes or pressure on the skin.6 

Chronic hives, also known as chronic urticaria, is a long-lasting, serious condition where a person experiences recurring itchy hives and/or deep tissue swelling for six weeks or longer.1 

For people with chronic spontaneous urticaria (CSU), symptoms often last 2 to 5 years on average, with many patients experiencing improvements over time.1 For those with chronic inducible urticaria (CIndU), how long symptoms last often depend on the type of trigger involved.1 

It’s also important to note that: 

  • Approximately 50% of people with chronic hives will see their symptoms resolve.3
  • Symptoms can persist for 1 to 5 years for many individuals, though for some patients, flare-ups can continue for longer periods of time.1
  • Even after a period of remission, it is possible for chronic hives to return later in life.7 

Chronic hives, also known as chronic urticaria, is not considered to be life-threatening.9 Despite this, both hives (the itchy, red welts on the surface of the skin) and in some cases, angioedema (deep tissue swelling) can be uncomfortable, distressing, and interfere with sleep and daily activities.9 

Symptoms can also leave individuals feeling frustrated without a diagnosis, and tired, isolated, depressed, or anxious.3  

Chronic hives, also known as chronic urticaria, can be difficult to diagnose, with some patients waiting between 2 and 5 years before receiving a formal diagnosis.7 This delay can be caused by several factors:

  1. Many cases do not have a clear trigger or cause.  
  • For up to 90% of people with chronic hives, there is no identifiable external trigger such as allergies, heat, or cold.1  These patients have chronic spontaneous urticaria (CSU), which is caused by an overactive immune system.4 For patients who have not received a formal CSU diagnosis, the endless search for an external trigger without success can be frustrating.1,7
  1. Symptoms can come and go quickly.  
  • Chronic hives symptoms can appear and disappear within 24 hours, making doctor visits challenging for patients.7 
  1. Testing is often inconclusive. 
  • Standard allergy tests may come back negative, especially if the condition isn’t driven by a classic allergy. There’s no single definitive test for chronic hives, so diagnosis is often based on medical history and identifying potential symptom patterns. Diagnosis typically involves a process of elimination to identify what, if anything, may be triggering a patient’s symptoms.7
  1. Patients often cycle through multiple health care providers.  
  • Before receiving a diagnosis, patients often see a number of different doctors, including primary care physicians, endocrinologists, rheumatologists, allergists, and dermatologists.7 For people with chronic hives, it’s recommended that they see an allergist or dermatologist.2  

Chronic spontaneous urticaria (CSU) is a serious condition that is thought to be linked to an overactive immune system as opposed to external triggers like allergies, heat, or cold.1,4  

While not fully understood, it is believed that in CSU patients, the body’s immune system triggers the release of chemicals like histamine that leads to red, swollen, and itchy hives.4 

Chronic inducible urticaria (CIndU) is a type of chronic hives where the reaction is caused by a specific trigger. Hives typically appear within minutes of exposure.1 

While there are several varieties, the three most common types are: 

Type 

Trigger 

What It Looks Like 

Symptomatic Dermographism (SD)5 

Friction or Scratching 

Raised, red or skin-colored welts (hives) that appear within minutes after scratching, rubbing, or pressure 

Cold Urticaria (ColdU)5 

Exposure to Cold 

Red welts and swelling develop on skin that has been exposed to cold air, water, or objects. 

Cholinergic Urticaria (CholU)5 

Increase in Body Temperature 

Many small, very itchy, pinpoint-sized hives brought on by exercise, hot showers, or sweating. 

Other less common forms of CIndU can be triggered by things like sustained, heavy pressure on the body for a prolonged period, such as from manual labor or tight clothing (delayed pressure urticaria), exposure to direct heat (heat urticaria), or by coming into contact with certain substances like foods, latex, or chemicals (contact urticaria). Less common triggers also include sunlight (solar urticaria), contact with water (aquagenic urticaria), or continuous vibration exposure, like using a push-style lawnmower (vibratory urticaria).2,6 

Chronic spontaneous urticaria (CSU) and chronic inducible urticaria (CIndU) are both types of chronic hives, but they differ in what triggers symptoms:1  

  • In CSU, hives and swelling occur without an external trigger. Symptoms can appear at any time and often seem unpredictable.1  
  • In CIndU, hives are triggered by identifiable external triggers such as heat, cold, exercise, or scratching. Symptoms usually appear in response to these triggers and may be more predictable.6   

Some people can have features of both CSU and CIndU at the same time, so doctors often evaluate patterns in symptoms and triggers to help make the diagnosis.1,6  It’s recommended that you record your flares in real time, taking photos and writing down symptoms, to aid in conversations with your doctor.7  

Explaining chronic hives, also known as chronic urticaria, can feel challenging, especially since symptoms may not always be visible and can vary from day to day.1 A simple, straightforward explanation is often enough to help family, friends, and coworkers understand the condition. It may also be helpful to share that:

  • Symptoms can come and go.
  • Flare-ups are not always linked to a clear external trigger.
  • Chronic hives are not contagious.
  • Patients may occasionally need to adjust plans or take a break during a flare.

For a resource on how to talk about chronic hives, check out this discussion guide.

Patients experiencing chronic hives, also known as chronic urticaria, should speak with a healthcare provider if symptoms are recurring or begin to interfere with daily activities, and/or sleep.2

Because chronic hives symptoms can worsen over time, a doctor can help confirm a diagnosis, identify potential triggers, and discuss treatment options to help manage symptoms.

Chronic hives (chronic urticaria) can be difficult to manage, but treatment options are available. Treatment approaches may vary depending on the type of chronic hives and how severe or persistent symptoms are.

For people living with chronic inducible urticaria (CIndU), avoiding known triggers—such as heat, cold, pressure or friction—may help reduce flare-ups, though this can be difficult in everyday life.6 

Antihistamines (AHs) are often the first treatment recommended for both CSU and CIndU. In some cases, doctors may recommend higher-than-usual doses depending on symptom severity.6 However, more than 50% of people with chronic hives continue to experience symptoms even with increased doses of antihistamines.3,7 For severe flare-ups, doctors may also prescribe short courses of oral steroids to temporarily reduce swelling and symptoms.7

For people living with chronic spontaneous urticaria (CSU) whose symptoms continue despite antihistamine treatment, there are FDA-approved prescription treatment options available.9 Your doctor can help determine the treatment plan that is most appropriate for your symptoms and experiences.

Chronic hives, also known as chronic urticaria, is often diagnosed and treated by allergists or dermatologists.2 These specialists are experienced in identifying different types of hives, ruling out other conditions, and creating treatment plans if symptoms persist.9  

Proactively tracking chronic hives (chronic urticaria) symptoms is one of the most important things patients can do to help doctors accurately diagnose the condition and find the most effective treatment plan.7 There is no singular test to confirm a chronic hives diagnosis.7 Instead, diagnosis requires a process of elimination to identify if chronic hives are being caused by an external trigger (inducible) or not (spontaneous).7   

When tracking chronic hives symptoms, it can be helpful to note: 

  • When symptoms are occurring (date and time).
  • How long hives or swelling lasts.
  • How severe symptoms are (such as itchiness, size of hives, or discomfort).
  • Where symptoms appear on the body.
  • Whether angioedema (deeper swelling) is present. 
  • Possible patterns over time, even if no clear trigger is found. 
  • Impact on daily life, including sleep, work, school, or activities. 
  • Any treatments used and if they helped.
  • Photos of outbreaks. 

It’s also important for patients to be open about how hives affect daily life, not just physically, but emotionally and practically. This may include sharing whether symptoms impact sleep, work, social plans, or overall quality of life. Providing this context can help your doctor better understand the full burden of the condition and inform treatment decisions.

Preparing questions in advance—such as those about possible causes, treatment options, or follow-up—can also be helpful. Being organized and transparent about the patient’s experience can support more informed, individualized care.1,2

For a resource on how to talk to your doctor about your chronic hives, check out this discussion guide. 

References:

  1. Kolkhir P, Giménez-Arnau AM, Kulthanan K, et al. Nat Rev Dis Primers. 2022;8:61. doi:10.1038/s41572-022-00389-z
  2. Cleveland Clinic. Chronic Hives (Chronic Idiopathic Urticaria). Accessed May 13, 2025. https://my.clevelandclinic.org/health/diseases/22900-chronic-hives 
  3. Maurer M, Weller K, Bindslev-Jensen C, et al. *Allergy.* 2011;66:317-330. doi:10.1111/j.1398-9995.2010.02496.x
  4. Kolkhir P, Munoz M, Asero R, et al. J Allergy Clin Immunol. 2022;149(6):1819-1831. doi:10.1016/j.jaci.2022.04.010
  5. Bizjak M and Košnik M. Key differences between chronic inducible and spontaneous urticaria. Frontiers in Allergy. 2024;5:1487831
  6. Maurer M, Bonnekoh H, Grekowitz E, et al. Allergy. 2024;79:2573-2576. doi:10.1111/all.16250
  7. Friedman A, Kwatra SG, Yosipovitch G. Dermatol Ther (Heidelb). 2024;14(6):1371-1387. doi:10.1007/s13555-024-01173-5
  8. Weller K, Winders T, McCarthy J, et al. Dermatol Ther (Heidelb). 2025;15:747-761. doi:10.1007/s13555-025-01348-8
  9. Mehta S, Goldin J, Danosos GN. Chronic Urticaria. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan. Updated March 25, 2026. https://www.ncbi.nlm.nih.gov/books/NBK555910