Postpartum thyroiditis is usually a transient phenomenon observed following pregnancy and may involve hyperthyroidism, hypothyroidism or the two sequentially. It is believed to result from the modifications to the immune system necessary in pregnancy, and histologically is a lymphocytic thyroiditis. The process is normally self-limmiting, but when conventional antibodies are found ther is a high chance of this proceeding to permanent hypothyroidism. The term trimester redirects here. ... Hyperthyroidism (or overactive thyroid gland) is the clinical syndrome caused by an excess of circulating free thyroxine (T4) or free triiodothyronine (T3), or both. ... This article or section does not cite its references or sources. ...
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