Menstruation is like a woman’s best friend, co-experiencing the richness of a woman’s life. Menstruation is an important and normal physiological phenomenon for women of childbearing age, and regular menstruation marks the maturity of reproductive function. Menstruation is the stripping and bleeding of the uterine lining that accompanies a woman’s ovarian cycle. The cycle is usually about 28 days long, with each period lasting about 2-8 days. The normal range of menstrual flow is 20-60 milliliters, and more than 80 milliliters is considered excessive. Most women have their 1st period around the age of 13-14 years, and the absence of a period after the age of 15 years should be noted for disease effects. Menopause may occur between the ages of 44-54. Normal menstrual blood is dark red in color. If the menstrual blood is not discharged properly and the menstrual flow is excessive, the menstrual blood may be dark red in color accompanied by large blood clots.