Women of childbearing age with regular menstrual cycles usually end their periods within 3-7 days. Menstruation refers to the cyclical shedding and bleeding of the uterine lining that accompanies the cyclical changes in the ovaries. When a woman begins puberty, she will have a cycle of menstruation. The normal menstrual cycle lasts 21-35 days, with an average of 28 days. The menstrual period lasts 3-7 days, the volume of menstrual flow is 30-70 ml, and the menstrual blood is dark red in color and free of blood clots and menstrual cramps. If a woman’s menstrual period is altered by exposure to cold or exertion, or by mood swings, the period may be lengthened or shortened, and the amount of menstrual flow may increase or decrease. In addition, during menstruation, women should pay attention to proper rest, maintain a relaxed mood, take good care of the warmth, and increase nutrition, which is conducive to the normalization of the menstrual cycle.