Menstruation is clinically diagnosed as hypomenorrhea if it is less than 20ml. The treatment of menorrhagia must be different according to the different causes of menorrhagia. The most common cause is polycystic ovary syndrome (PCOS), which is caused by endocrine disorders, and high androgen, leading to low menstrual flow and even amenorrhea, so it is necessary to lower the androgen. If there is a plan to get pregnant, then ovulation stimulation treatment. If there is no plan to get pregnant, artificial cycle treatment. If the cause of the menorrhagia is endometrial tuberculosis, diagnostic curettage is needed, between the 6th and 12th hour of menstruation, followed by anti-tuberculosis treatment. Repeated abortions have caused partial adhesions in the uterine cavity, resulting in clinically low menstrual flow. Hysteroscopy is needed and the adherent tissue is separated.