Low menstrual flow in polycystic ovary syndrome may be mainly due to anovulatory type menstruation and abnormal uterine bleeding, which can be treated by medication and surgery. Common causes 1. Anovulatory type of menstruation: Anovulatory type of menstruation caused by the absence of ovulation in the ovaries due to polycystic ovary syndrome is clinically manifested by completely irregular menstruation, often without dysmenorrhea. The type of bleeding depends on the level of serum estrogen and the speed of its decrease, as well as the duration of the continuous action of estrogen on the endometrium and the thickness of the endometrium, which can be manifested as menstrual volume can be small or even dripping; 2. Abnormal uterine bleeding: it can be manifested as bleeding in small amounts but dripping. Treatment 1, medication: Under the guidance of doctors, oral contraceptive pills or progestin post-cycle therapy to regulate the menstrual cycle, such as dihydrogesterone tablets, and also glucocorticosteroids, cyproterone, spironolactone and other drugs to reduce androgen levels, and the application of metformin to improve insulin resistance treatment. For patients with fertility requirements, after basic treatment such as lifestyle adjustment, anti-androgen and improvement of insulin resistance, ovulation promotion therapy is carried out, and the commonly used ovulation promotion drug is clomiphene. 2.