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KAORU NOMURA, HIDETOSHI SUZUKI, MOTOYASU SAJI, NOBUO HORIBA, MAKOTO UJIHARA, TOSHIO TSUSHIMA, HIROSHI DEMURA, KAZUO SHIZUME, High Serum Progesterone in Hyperthyroid Men with Graves' Disease, The Journal of Clinical Endocrinology & Metabolism, Volume 66, Issue 1, 1 January 1988, Pages 230–232, https://doi.org/10.1210/jcem-66-1-230
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Abstract
We measured serum progesterone in five men with hyperthyroidism due to Graves' disease. All had elevated serum progesterone levels before treatment with an antithyroid drug, and their serum progesterone levels declined concomitantly with their serum thyroid levels during treatment. Progesterone enhances estrogen's stimulation of mammary gland growth, and our findings suggest that progesterone may play a role in the gynecomastia that occurs in men with hyperthyroidism.