Menstruation, for women, is so commonplace that some even loathe it, thinking it gets in the way and is inconvenient. But did you know? This ordinary menstruation, is a sign of female reproductive endocrine development and maturity, is one of the external signs of women with fertility conditions. The ancient saying is: women two seven (14 years old) and the day sebum to, any vein through, Taichong vein Sheng, menstruation to the time, so there are children,…… four seven and tendons and bones firm, hair long pole, the body is strong; seven seven (49 years old) any vein deficiency, Taichong vein mourning less, the day sebum exhausted, the ground is not accessible, so the form is bad and no children. The image expresses the process of female menstruation and human growth and development, reproductive physiological function Sheng and mourning. Speaking of menstruation, we need to talk about the menstrual cycle, which is the interval between the first day of each menstrual period and the first day of the next menstrual period. The normal menstrual cycle for women is 28-30 days, and a delay or advance of 7-10 days is still within the normal range. The normal menstruation of women is affected by the following three factors: 1) normal function of the physiological regulation center of menstruation; 2) normal ovulation of the ovaries; 3) normal growth and development and shedding of the endometrium. Menstrual blood is the process of shedding the endometrium and discharging it with the body blood. Abnormalities in any one of these processes can cause abnormal menstruation. Common menstrual abnormalities include: 1. scanty menstruation; 2. frequent menstruation; 3. excessive menstruation; 4. scanty menstruation; 5. intermenstrual bleeding; 6. irregular vaginal bleeding. If the above conditions occur repeatedly, it means that your endocrine function or uterus and ovaries are abnormal and need timely adjustment and treatment.