A woman’s menstrual cycle lasts 28 days on average, but it is normal for menstruation to occur 1 week earlier or later due to personal constitution, heredity, environmental factors, and so on. A woman’s menstrual cycle ranges from 21 to 35 days, and is usually around 28 days, within which it is normal. Occasionally, if the menstrual cycle is too short, but there is no other abnormality during the menstrual period, it may be related to mental stress, environment and other factors, and generally through active improvement of life, adjusting the psychological pressure can be gradually restored to normal, so there is no need to worry too much. If the menstrual cycle is less than 21 days for a long time, it may be due to ovarian dysfunction or insufficient corpus luteum function, and it is recommended to go to the gynecology department of the hospital in time to look for the cause and actively treat it. Women with early menstruation should pay more attention to strengthening nutrition in their diet, consuming more high protein food and supplementing more iron containing substances. If you are under too much mental stress, you should adjust your emotions.