Menstruation usually lasts for about a week and does not come back within 1-2 days after the end of menstruation. In this case, the appearance of brownish discharge after the period is considered abnormal, and the main reason is the irregular shedding of the uterine lining. Normally speaking, the endometrium usually sheds completely in about a week during menstruation. If the shedding is incomplete and a small part of the endometrium may shed again at the end, which is caused by the abnormal luteal function in the body, it is necessary to carry out a hormone level test, and at the same time do a diagnostic scraping of the endometrium to carry out a histological examination, to make clear whether or not there is any problem with the function of the luteal body. If the luteal function is abnormal, progesterone supplementation or progesterone cycling is usually needed to solve the problem. Sometimes there may be not only abnormal luteal function, but also organic pathology, such as endometrial polyps or endometrial tumors, which can be clarified by endometrial pathology.