Original article
Syndrome of idiopathic chronic urticaria and angioedema with thyroid autoimmunity: A study of 90 patients

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Abstract

From a pool of 624 patients with idiopathic chronic urticaria and angioedema, 90 patients had evidence of associated thyroid autoimmunity (TA). Since the number expected by chance alone is 37, given that <6% of normal subjects have TA, the association is significant (p < 0.01; chi-square test). Age and sex distribution was typical of patients with TA. Clinically, most patients suffered relentless and severe urticaria and/or angioedema. With the exception of thyroid function and thyroid antibody tests, other laboratory tests were not rewarding. In most cases, treatment with 1 thyroxine did not improve urticaria or angioedema, but a few patients demonstrated a dramatic response. Awareness of the association resulted in the identification of previously undiagnosed thyroid disease. The authors hypothesize that a subset of idiopathic chronic urticaria and angioedema may be an autoimmune disease.

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