Uterine bleeding may be caused by physiological reasons (such as menstruation, ovulation bleeding, etc.) or pathological reasons (such as uterine fibroids, adenomyosis, endometrial polyps, etc.), which need to be analyzed in the context of the specific situation. 1. Physiological bleeding: women bleed during each menstrual period or ovulation, because the withdrawal of hormones in the body will cause endometrial ischemia and shedding, which is manifested as uterine bleeding, ovulation bleeding is usually a small amount of bleeding in the middle of the two menstrual periods, and if it is a menstrual bleed, it is usually 20-60 ml for an average of 4-6 days. 2. Pathological bleeding: there are many reasons for pathological bleeding, which may be due to miscarriage in pregnant women, or bleeding caused by diseases, such as hormone secretion abnormality, endometrial cancer, endometrial polyps, and other diseases resulting in abnormal proliferation or shedding of the uterine lining, which may cause abnormal bleeding in the uterine cavity. When a woman experiences uterine bleeding during non-menstrual period or after childbirth, the cause of uterine bleeding needs to be clarified, and she can go to the hospital for sex hormone, ultrasound and other examinations, and under the guidance of the doctor, further treatment will be carried out.