When a woman has her first period, the number of days is usually around 7-8 days. This may be due to the fact that the endometrium of the uterus grows thicker during the first menstruation and the cervical opening is tighter, so it may take a little longer for the menstrual blood to flow out. During this period, women should pay attention to proper rest, do not work hard, live a regular life, and do not eat cold or spicy food, which may affect the discharge of menstruation and lead to prolonged or shortened periods, which is detrimental to women’s health. The onset of menstruation marks the beginning of puberty and allows the normal peeling and bleeding of the endometrium to occur. Therefore, women should also pay attention to keep their vulva clean and hygienic during this period to reduce the occurrence of infections, which is beneficial to the healthy development of the body.