Abnormal uterine bleeding is mainly categorized by ovulation disorder, organic lesions, overuse of contraceptive pills, intrauterine device, and blood system diseases. 1. Ovulation disorder: If a woman has ovulation disorder, it may lead to abnormal uterine bleeding. 2. Organic lesions: Abnormal uterine bleeding caused by organic lesions, common lesions include endometrial polyps, uterine submucous fibroids, adenomyosis and so on. 3. Excessive use of contraceptive pills: Abnormal uterine bleeding can easily occur when contraceptive pills are used excessively; in addition, if women use contraceptive pills frequently, abnormal uterine bleeding may also be caused. 4. Intrauterine device (IUD): When the IUD is placed in the uterus of a woman, abnormal uterine bleeding may also occur when the position of the IUD is abnormal. 5. Blood system diseases: If a woman suffers from blood diseases such as leukemia, thrombocytopenia, coagulation factor deficiency, aplastic anemia, etc., it may lead to abnormal uterine bleeding. If a woman finds abnormal uterine bleeding, she should go to the hospital in time to see the doctor, and give appropriate treatment and therapy under the doctor’s guidance after the cause of the disease is clarified.