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Can hives suddenly appear for no reason?

Submitted by admin on Tue, 11/23/2021 - 00:47

Spontaneous hives is a very burdensome condition which not only has painful symptoms but can affect how someone feels about themselves, their relationships with friends and families, or whether they can work or go to school.1-3

Chronic urticaria affects 1% of the population and is defined as hives and/or swelling lasting more than 6 weeks.4 Up to 75% of these chronic hives sufferers have chronic spontaneous urticaria, a form of the condition that can occur unpredictably without an identifiable trigger.1 Chronic spontaneous urticaria is more common in women than men and peaks between the ages of 20 and 40 years.1

Most cases of spontaneous hives involve the presence of an autoantibody which attaches to mast cells and basophils to activate them and which results in the release of histamines and other chemicals that cause the hives.5

It can be very frustrating to not know what the specific cause is and not know when the hives will appear, making it difficult for you to live a normal life. There are effective treatment options. For some of these treatments you need to be in the care of an immunologist or dermatologist. Speak to your GP about a referral to an urticaria specialist.

Chronic spontaneous hives are usually not allergy related. Take the test to find out how hives are impacting your life.

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Australasian Society of Clinical Immunology and Allergy (ASCIA) Skin Cancer Foundation Australasian College of Dermatologists

 

References

  • Maurer M et al. Allergy 2011; 66:317–330.
  • Maurer M et al. Allergy 2017; 72: 2005-2016.
  • Mendelson M et al. J Dermatol Treat 2017; 28:229-236.
  • Australasian Society of Clinical Immunology and Allergy. ASCIA PC Hives Urticaria 20204. Available from https://allergy.org.au/patients/skin-allergy/urticaria-hives Accessed May 2026.
  • Asero R et al. F1000 Research 2017; 6:1095.
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Topics

What is hives (urticaria)?
  • What is hives (urticaria)?
  • How does the immune system cause hives?
Symptoms of hives (urticaria)
  • Where can hives appear on the body?
  • What are the symptoms of hives (urticaria)?
Types of Hives (Urticaria)
  • Are there multiple types of hives (urticaria)?
  • Are there different types of hives (urticaria)?
  • Is chronic hives the same as chronic urticaria?
Causes of hives
  • What causes itchy hives?
  • What causes hives?
  • How are hives (urticaria) treated?
Chronic spontaneous urticaria
  • What is chronic spontaneous urticaria?
  • What treatments are there for chronic spontaneous urticaria?
  • Are there guidelines for treating chronic spontaneous urticaria?
  • Can hives suddenly appear for no reason?
  • Is chronic spontaneous urticaria caused by allergies?
  • What causes chronic spontaneous urticaria?
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  • What is hives (urticaria)? What is hives (urticaria)? How does the immune system cause hives?
  • Symptoms of hives (urticaria) Where can hives appear on the body? What are the symptoms of hives (urticaria)?
  • Types of Hives (Urticaria) Are there multiple types of hives (urticaria)? Are there different types of hives (urticaria)? Is chronic hives the same as chronic urticaria?
  • Causes of hives What causes itchy hives? What causes hives? How are hives (urticaria) treated?
  • Chronic spontaneous urticaria What is chronic spontaneous urticaria? What treatments are there for chronic spontaneous urticaria? Are there guidelines for treating chronic spontaneous urticaria? Can hives suddenly appear for no reason? Is chronic spontaneous urticaria caused by allergies? What causes chronic spontaneous urticaria?