The factors that cause the menstrual volume to become low are as follows: First, the menstrual volume decreases due to the stimulation of cold or work and life stress during the menstrual period, which causes pelvic blood circulation to become stagnant and blood stasis. Secondly, when women suffer from gynecological diseases, such as thin endometrium or endometrial damage after abortion, uterine cavity adhesions, polycystic ovary syndrome, etc., the endometrium does not grow thicker as expected due to the reduction in the level of estrogen secreted by the ovaries, and the menstrual flow will be reduced. Third, when women suffer from endocrine disorders, such as hyperthyroidism, pituitary tumors, etc., there will also be a decrease in menstrual flow or even amenorrhea. When women have reduced menstrual flow, first pay attention to proper rest, do not eat cold food, relax, increase nutrition, avoid uterine cavity operations, if necessary, you can go to the hospital to do gynecological ultrasound and sex hormone six examination, according to the results of the examination and take the appropriate treatment, which is conducive to the recovery of the disease.