Abstract

Compensated hypothyroidism was diagnosed in a 36-year-old female who presented with breast tenderness and mild galactorrhoea. T4 was 5.8 mcg dl-1 and T3RU was 22.5%, while TSH and prolactin were very mildly elevated (6.5 mU ml-1 and 26.1 ng ml-1, respectively). The TRH test showed an exaggerated response. TSH increased to 43 mU ml-1, and prolactin levels reached 161 ng ml-1. Treatment with T4 decreased the TSH and prolactin levels to within the normal range, and prevented the galactorrhoea. The case presented here demonstrates that galactorrhoea can be present even with mild hypothyroidism.

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