A woman’s menstruation usually lasts in the range of 2-7 days. Menstruation is the regular shedding and bleeding of a woman’s uterine lining. Vaginal bleeding usually occurs once a month, with a cycle of 28-35 days and a period of 2-7 days. If the menstrual period is less than 2 days and the volume of menstruation is less than 20 ml, it means that the menstruation is scanty. If the period is more than 7 days and the volume of menstrual blood is more than 80ml, it means excessive menstruation. Whether it is too much or too little, it should be checked. If excessive stress, poor nutrition, environmental changes, or endocrine disorders can affect a woman’s menstrual cycle and period. If there is an abnormality in menstruation, it may affect future pregnancy, so it is important to get enough sleep, balanced nutrition and a good mental state, which is also conducive to having regular menstruation.