This review summarizes current knowledge of the effects of polycystic ovary syndrome, Cushing’s syndrome, thyrotoxicosis, hypothyroidism, primary hyperparathyroidism, acromegaly, hypopituitarism, and growth hormone deficiency on coagulation and fibrinolysis. Several abnormalities of the coagulation-fibrinolytic system have been described among patients affected by these endocrine disorders. Although further larger studies are needed to provide more definitive information, clinically overt hypothyroidism appears to be associated with a bleeding tendency, whereas all other endocrine diseases appear to be associated with a thrombotic tendency. The disorders of coagulation and fibrinolysis observed in these endocrine pathologies usually range from mild to moderate and, rarely, to potentially severe laboratory abnormalities (e.g., bleeding diathesis in overt hypothyroidism mainly due to an acquired von Willebrand’s syndrome type 1), are reversible after pharmacologic treatment of the hormonal dysfunction, and are usually of limited consequence in clinical practice. Nevertheless, the prompt recognition of potentially severe disorders of blood coagulation is mandatory for the correct management ofthese patients.
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