The physiological period of women is 3-7 days, at most not more than 7 days, less than 3 days is considered too short menstrual cycle, more than 7 days is considered too long menstrual cycle, too short or too long menstrual cycle is not normal, need to go to the hospital to identify the cause and treatment. The most common reason for short menstrual cycle is that the amount and duration of menstrual blood is reduced due to the deficiency of liver menstruation, which can be treated with herbal medicine or Chinese medicine for regulating liver menstruation. In addition to observing the number of days of menstruation, women should pay attention to the color of menstrual blood, most of which is dark red, and the volume of menstruation is about 50 ml, not exceeding 80 ml at most, more than 80 ml is called excessive menstruation.