When the menstrual volume appears to be less than once, endocrine hormonal problems are considered. When polycystic ovary syndrome, hypothyroidism, hyperthyroidism, prolactinemia, estrogen deficiency and progesterone deficiency are present, the growth of the endometrium can slow down and the volume of menstruation may be less, and even the color may change to some extent. Gynecological diseases, such as endometrial inflammation, pelvic inflammatory disease, or even cervical inflammation, can also cause a low menstrual flow. In this case, you need to go to the hospital to check the six endocrine hormones on an empty stomach, including ultrasound, to determine what is causing the problem. You can take oral cycle regulating medications, such as Glivec plus progesterone, short-acting contraceptive pills to regulate the cycle and repair the endometrium, which can restore the normal menstrual cycle and avoid prolonged low menstrual flow, which may have certain effects on health and fertility.