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What causes chronic urticaria?

ANSWER

Chronic urticaria refers to hives or swelling that lasts more than 6 weeks. The cause is usually harder to find than in acute cases. The causes can be similar to those of acute urticaria but can also include your immune system, chronic infections, hormonal disorders, and tumors.

SOURCES: 

Medscape: "Angioedema." 

MedicineNet: "Hives (Uticaria & Angioedema)."

American Academy of Dermatology: "Hives."

Muller, B. March 2004. American Family Physician,


 

Reviewed by Stephanie S. Gardner on October 13, 2017

SOURCES: 

Medscape: "Angioedema." 

MedicineNet: "Hives (Uticaria & Angioedema)."

American Academy of Dermatology: "Hives."

Muller, B. March 2004. American Family Physician,


 

Reviewed by Stephanie S. Gardner on October 13, 2017

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What causes physical urticaria?

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