Chronic urticaria and thyroid auto-immunity.

Purpose was to evaluate thyroid auto-immunity and thyroid function in chronic urticaria (CU). Evaluation of antibodies Ab to thyroglobulin (TG) thyroid peroxidase (TPO) and of TSH, FT3, FT4, and of intra-dermal self test with patients own serum in 56 patients presenting chronic idiopathic urticaria and in a matched control group of 56 subjects without CU. Ab to TG positive in 13 (22.2%) to TPO in 15 (26.8%). Overall thyroid antibodies 28.5%. Thyroid function normal in 52 patients, TSH increased in 2, FT3 decreased in 1, TG and TPO Abs and thyroid function results always normal in control group. Self test positive in 4 out of 56 patients. Therapy with thyroid extract was effective in 2 out of 5 cases. CU is associated with thyroid autoimmunity in most cases. Thyroid Ab and function must be evaluated in all the cases of chronic urticaria.