The normal menstrual cycle is 28-30 days, the period is 2-7 days, and the menstrual volume is 50-80 ML. Abnormal uterine bleeding is defined as: prolonged or excessive menstruation or both, frequent menstruation, non-menstrual or intermenstrual bleeding, bleeding after intercourse, or postmenopausal bleeding. Abnormal uterine bleeding due to organic causes accounts for about 25% of patients, while the rest are due to abnormalities of the hypothalamic-pituitary-ovarian axis (dysfunctional uterine bleeding). Dysfunctional uterine bleeding is the most common cause of abnormal uterine bleeding, while organic diseases, including gynecologic tumors, gradually increase with age. Common causes of abnormal uterine bleeding: 1) dysfunctional uterine bleeding; 2) uterine fibroids; 3) endometrial polyps; 4) uterine adenopathy; 5) pregnancy-related diseases such as ectopic pregnancy, abortion, trophoblastic diseases; 6) genital malignant tumors such as cervical cancer, endometrial cancer, ovarian tumors, etc.; 7) genital inflammatory diseases. Key points of abnormal uterine bleeding diagnosis and treatment: 1. Once patients have the above symptoms, they should go to the regular doctor in time; 2. routine gynecological examination; 3. cervical cancer prevention examination and ultrasound examination are selected; 4. essential auxiliary examination is hysteroscopy combined with ultrasound examination and diagnostic scraping, which is the first choice of auxiliary examination for abnormal uterine bleeding. For abnormal uterine bleeding caused by lesions in the uterine cavity such as submucosal fibroids, endometrial polyps, meritorious bleeding where drug treatment is ineffective, and uterine myopathy, surgery can also be performed under hysteroscopy with good treatment effect, little trauma and fast recovery after surgery.