The menstrual cycle is normal between 21-35 days. It is normal to have menstruation about 7 days early, which has great individual differences and varies from person to person. It is necessary to observe whether there is an increase in menstrual volume and menstrual discomfort. Normal women have a menstrual cycle, which is mainly regulated by the sex hormone regulation axis in the body, all of which can affect the normal menstrual cycle. Excessive weather changes, sudden weight changes, excessive mood swings, and excessive dietary changes can lead to changes in the menstrual cycle. If a sexually active woman of childbearing age experiences early or delayed menstruation, she needs to be alerted to the occurrence of pregnancy and, if necessary, needs to undergo relevant tests to avoid ectopic pregnancy. During menstruation, women’s resistance decreases, which can easily lead to infections, especially in the reproductive system, and they need to pay attention to local cleanliness and hygiene.