Menstruation five or six days in advance is subject to hormonal changes in the body endometrium cyclic shedding, is a normal phenomenon, do not need to be too nervous and worried. However, you need to observe the duration of menstruation and the amount of menstruation during the menstrual period, if each time the duration is longer than a week or the amount of menstruation increases, you need to exclude organic lesions. Menstrual changes are related to many factors, such as mental stress, poor nutritional metabolism, sudden changes in the environment and climate, dietary disorders, excessive exercise, and oral medications can cause menstrual changes. If the above causes are excluded, ultrasound examination is needed to find out whether there are any abnormalities in the uterus, endometrial polyps, intrauterine space-occupying lesions, or uterine fibroids, which are pathological factors that can also lead to changes in menstruation. Therefore, if menstrual abnormalities or other discomforts occur, it is recommended to go to the hospital in time for examination to identify the cause of the abnormalities and follow the doctor’s instructions for treatment.