There may be several reasons for low menstrual flow: i. As women age, the number of follicular reserves decreases and the quality of eggs decreases, in which case the secretion of estrogen and progesterone decreases, resulting in a decrease in menstrual flow. Second, the decrease in menstrual flow caused by endometrial damage, such as abortion and curettage, IUD and other uterine operations, resulting in endometrial damage, endometrial adhesions, etc. Third, when suffering from some endocrine diseases, it can also lead to reduced menstrual flow, such as ovarian hypofunction, abnormal thyroid function, polycystic ovary syndrome, hyperprolactinemia, etc. These can lead to low menstrual flow. You need to check the hormone 6 test to see if there are any endocrine abnormalities, and if there are abnormalities, you can regulate your menstruation by estrogen and progesterone. If there is no endocrine problem, further hysteroscopy is needed to check whether there is any organic lesion of the uterus.