It is normal for a woman to have her period for 3-7 days. Because of the individual differences of each woman, the duration of menstruation varies, and if it is less than 3 days or more than 7 days, it is not normal and is a sign of irregular menstruation. If the period is less than 3 days, it means that there is not enough estrogen secretion, and it may also be affected by emotions, if the long-term stress is too much, it is easy to cause anxiety and shorten the period, which is harmful to the uterus if it is long-term. If the period exceeds 7 days, it may be the presence of gynecological diseases, prone to ischemia, and may induce infertility, infertility, is more serious, you need to go to the hospital in a timely manner, the relevant examination, symptomatic treatment. During menstruation, women should pay attention to rest, avoid straining, pay attention to a light and mild diet, and pay attention to keeping warm.