Abstract:To explore the risk factors of hyperthyroidism complicated with acute coronary syndrome(ACS). Methods The patients with hyperthyroidism complicated with ACS and the patients with hyperthyroidism from January 2010 to December 2016 were enrolled into ACS group and control group respectively. The clinical data including sex, age, smoking, biochemical indexes and coronary angiograms were collected and compared, and the risk factors were analyzed. Results The course of hyperthyroidism in the ACS group was longer than that in the control group, the uncontrol rate of hyperthyroidism was higher that of the control group, the average age was older than that of the control group, and the proportion of the male patients was higher than that of the control group. The levels of FT3, FBG, HbA1c and BNP in the ACS group were significantly higher than those in the control group (p < 0.05). Logistic regression analysis showed that age, sex, FT3, hyperglycemia and longer course of hyperthyroidism were the risk factors of hyperthyroidism complicatd with ACS. Conclusions Many factors can affect the occurrence of ACS in patients with hyperthyroidism.