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In this article the following is stated: A number of factors have been reported to cause chronic urticaria, and these include the following: Autoimmune disease: Urticaria has been associated with a number of autoimmune diseases, including systemic lupus erythematosus, cryoglobulinemia, juvenile rheumatoid arthritis, and autoimmune thyroid disease (patients may be euthyroid but respond to replacement therapy). http://emedicine.medscape.com/article/1050052-overview
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