The following are some of the more common clinical causes of old bleeding from the uterus: First, endometrial lesions, due to endometrial cancer, endometrial polyps, endometrial submucosal fibroids, can cause irregular bleeding from the uterus, accompanied by prolonged menstrual periods and irregular periods, which require an ultrasound examination at the hospital and, if necessary, a hysteroscopy to determine the diagnosis. Secondly, the old bleeding from the uterus may be caused by the residual fetal membrane tissue after abortion or induction of labor, which can also cause the old bleeding from the uterus after childbirth, which needs to be examined in the hospital, and can be determined by blood HCG measurement and ultrasonography to determine whether there is residual tissue in the uterine cavity, and if necessary, scraping surgery. Thirdly, old bleeding from the uterus may also be caused by lesions of the cervix, such as cervical cancer, cervical polyps, and cervical inflammation, which can also manifest as vaginal bleeding. This can be diagnosed and treated clinically through internal examination, colposcopy, and biopsy.