Menstruation is a sign of the maturity of the female reproductive system, and normal menstruation means that a woman is fertile. Under the influence of estrogen, the endometrium thickens and luteinizing hormone prompts the secretion of progesterone before ovulation occurs and normal ovulation leads to conception. Menstrual blood is composed of vaginal epithelial cells, blood, debris shed from the endometrium, and other necrotic tissues. It is usually red in color, and if it is dark or has blood clots, it may be due to cold clotting, qi stagnation and blood stasis. Menstruation reflects a woman’s body and is a reflection of ovarian function. Normal menstruation is regular, with an early or delayed period of no more than one week, such as a delay of more than one week in women of childbearing age with regular menstruation is first ruled out as early pregnancy. Menstruation can also change when suffering from gynecological diseases, such as pelvic disease, ovarian hypofunction, tumors, etc., which can lead to prolonged menstruation or excessive menstrual bleeding, and problems with menstruation should be seen by a doctor in time for diagnosis and treatment.