How many days does menstruation usually occur? How much menstrual blood is normal?

Girls will always menstruate. The first menarche is called menarche, and most of the menarche ages are between 13~15 years old, but they may be as early as 11~12 years old and as late as 17~18 years old. How many days do girls usually have menstruation? Let's take a look at some things to keep in mind about menstruation. The first day of bleeding (i.e., menstrual cramps) is called the beginning of the menstrual cycle, and the interval between the first days of two menstruations is called a menstrual cycle, which is generally 28~30 days, which is about the same time as a lunar month. The length of the cycle varies from person to person, but occasionally it can be considered normal if it is not more than 7 days earlier or later, i.e. the menstrual cycle should not be less than 21 days and should not exceed 35 days. Menstruation will stop during pregnancy and breastfeeding. How many days does a woman's menstrual period usually take? Menstruation refers to the duration of menstrual cramps. Normal menstruation lasts for 2~7 days, generally 4~5 days. Menstrual flow refers to the amount of blood that is expelled during menstruation. It is difficult to calculate the amount of menstrual flow, and it is commonly used in clinical practice to change the number of menstrual pads per day to roughly estimate the amount.Some people have measured that the menstrual blood volume of normal people is about 10~58ml, and the menstrual blood volume of individual women can exceed 100ml. It has been assumed that a monthly blood loss of more than 80 ml is considered pathological. Generally, the amount of bleeding is the highest on the 2nd~3rd day of menstruation. Due to the individual's physique, age, climate, region and living conditions, menstrual flow sometimes increases or decreases slightly, which is a normal physiological category. Menstrual color refers to the color of menstrual blood. Menstrual blood is generally dark red, lighter at first, gradually deepens, and finally turns pale red and clean. In addition to blood, it contains endometrial fragments, cervical mucus, and vaginal epithelial cells. The main feature of menstrual blood is that it does not clot, but there are occasional small clots under normal circumstances. Menstrual quality refers to the characteristics of menstrual blood, under normal circumstances, menstrual quality is not thin or thick, not easy to coagulate, no obvious blood clots, no special smell. The pathological changes of menstrual quality are not only common menstrual diseases, but also an important basis for clinical syndrome differentiation. By understanding the changes in meridian quality, it can provide important clinical information for syndrome differentiation. Women with menstrual cramps and thick or sticky menstrual blood are called "menstrual viscousity".