Chronic spontaneous urticaria (CSU) is defined as the spontaneous appearance of wheals, angioedema or both, lasting for more than 6 weeks. The cause is unknown.

Urticaria may be classified into different subtypes based on duration and cause.

Classifying chronic urticaria:1


Adapted from Zuberbier T et al. 2018.1


CSU, chronic spontaneous urticaria.



  1. Zuberbier T, et al. Allergy 2018;73(7):1393–1414.
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UK | October 2021 | 146364

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