Polycystic ovary syndrome (PCOS) is a group of endocrine disorder diseases characterized by extended menstrual cycles and anovulation as the main clinical manifestations. Due to increased levels of estrogen and testosterone in the body, the menstrual cycle is prolonged and the endometrium relatively thickens. PCOS generally does not cause cancer, but the long-term increase in testosterone during the perimenopausal period can cause abnormal proliferation of the endometrial lining, which might lead to endometrial cancer. Therefore, if the menstrual cycle is delayed for more than two months, it is recommended to use medication to promote the shedding of the endometrial lining, to prevent endometrial thickening and pathological changes.