Menstruation in three days and the amount is very small is a significant decrease in menstrual flow, may be the ovarian function is reduced or the uterine cavity endometrial abnormality, and the corresponding situation. If the ovarian function is abnormal, the corresponding sex hormone test should be performed to find out whether there is any abnormal change in the ovarian function, and the thickness of the endometrium should be taken into consideration. If it is an ovarian abnormality, hormonal therapy should be given if necessary. If there are abnormalities in the uterine cavity, such as whether there are previous repeated abortions or purging operations, appropriate hysteroscopy should be performed to find out whether there are adhesions in the uterine cavity. If there are obvious adhesions, hysteroscopic endometrial adhesion detachment should be performed, and estrogen should be applied after the operation to further reduce the chances of recurrence of adhesions, and the situation of reduced menstrual flow will be significantly improved after the corresponding treatment. If there is a request for childbearing, the success rate of pregnancy will also be further improved.