If menstruation is early and the quantity is low, the most common cause is endocrine imbalance, which is commonly caused by estrogen and progesterone deficiency, and then the menstruation is early and the quantity is low. Medical history. If you have a history of abortion or a history of cervical surgery, you should consider the possibility of incomplete adhesion of the uterine cavity due to endometrial damage, so if necessary, a hysteroscopy should be done to find out if there is any damage to the endometrium, and if there is adhesion of the uterine cavity, the adhesions can be separated under the hysteroscope to improve the low menstrual flow. If there are adhesions, the adhesions can be separated under hysteroscopy, which will improve this low menstrual flow.