The general duration of menstruation is 3-7 days, less than 2 days indicates a short period and more than 7 days indicates a long period. Menstruation is the cyclical change in ovarian hormone levels that cause the endometrium to shed and bleed periodically. At the beginning, menstrual blood is dark red in color and contains blood, endometrial debris, vaginal epithelial cells, uterine and vaginal mucus; later menstrual blood is darker and brown in color. Under normal circumstances, the endometrium can be shed completely and enter a state of repair within 7 days, so the duration of menstrual period is 3-7 days. If the menstrual period is too short or too long for 3 months in a row, menstrual disorders are considered and it is recommended to go to a gynecological clinic to find out the cause in time. During menstruation, women need to pay attention to personal hygiene, change sanitary napkins regularly and try not to take a sitz bath to avoid infection. In addition, sexual intercourse should be prohibited, pay attention to keep warm and avoid spicy and cold food.