What is menstruation? Menstruation is the periodic shedding and bleeding of the endometrium that occurs as a result of cyclical changes in the ovaries, which occurs once a month, week after week, on schedule and at the right time. The appearance of regular menstruation is an important sign of maturity in reproductive function. Menstrual blood is dark red in color and contains, in addition to blood, endometrial debris, cervical mucus and shed vaginal epithelial cells. Normal menstrual cycle performance? The first day of bleeding is the beginning of the menstrual cycle, and the interval between the first day of two menstrual periods is called a menstrual cycle. The normal duration is 21 to 35 days, with an average of 28 days. The duration of each menstruation is the period, which is normally 2~8 days, with an average of 4~6 days. The volume of menstruation is the total blood loss of one menstrual cycle. The normal volume of menstruation is 20~60ml, more than 80ml is excessive menstruation and less than 5ml is scanty menstruation. A regular menstrual cycle should vary less than 7 days. How many days of menstruation do I need to see a doctor? For regular menstruation, it is necessary to consult a doctor after 1 week of menstruation. For women who have sexual intercourse, the first thing to do is to check whether there is any conception. What does normal leukorrhea look like? It is a white, thin paste or egg white, sticky, small amount, no fishy smell, called physiological leucorrhea. It usually increases slightly before menstruation, during ovulation, after menstruation or during pregnancy. What is the condition of leukorrhea that requires medical attention? If you find abnormal leucorrhea, the vagina has the ability to regulate itself, but if it does not improve after a few days of observation, especially if there is bloody leucorrhea, it is best to go to a regular hospital to receive diagnosis and treatment in time.