Thyroid stimulating hormone production is blunted by somatostatin (SRIH), rising levels of glucocorticoids (ex. cortisol) and sex hormones (estrogen and testosterone), and excessively high blood iodide.
http://en.wikipedia.org/wiki/Thyroid
Excess estrogen can reduce the effect of thyroid hormone and lock it out from receptor sites on tissue cells.
http://www.baumancollege.com/Articles/hashimotos-article.html
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If a protein called thyroid binding globulin (TBG) level is high, which can occur when estrogen levels are high, the TBG will bind more thyroid hormone, decreasing the free hormone available in the blood, which leads to stimulation of TSH, and the production of more thyroid hormone. T4 circulates in the blood in two forms: 1) T4 bound to proteins that prevent the T4 from entering the various tissues that need thyroid hormone and 2) free T4, which does enter the various target tissues to exert its effects.
http://www.reference.com/browse/Thyroxine-binding_globulin
Both estrogen and prolactin induce lupus in mice.
http://linkinghub.elsevier.com/retrieve/pii/S1571507807002036
Other pages located under Estrogen:
Estrogen and Fibrocystic Breast