Hysteroscopy is mainly used for the diagnosis and treatment of diseases inside the uterine cavity, it can clearly observe the various changes in the uterine cavity, make a clear diagnosis and give treatment, the following diseases need to do hysteroscopy: 1, such as abnormal uterine bleeding, vaginal bleeding during the reproductive period or perimenopausal period and postmenopausal period, menstrual disorders such as excessive menstruation, excessive frequency, prolonged menstruation period, or irregular vaginal bleeding, which are the main indications for hysteroscopy; 2, during routine physical examination, patients often say that ultrasound suggests that there is an abnormal sound in the uterine cavity. These are the main indications for hysteroscopy; 2, routine physical examination, there are often patients who say that ultrasound suggests that there is an abnormal sound in the uterine cavity, and this kind of patients can do hysteroscopy; 3, there are also patients with infertility, if they are infertile or habitual miscarriage, it is routinely recommended that they do hysteroscopy, to observe the anatomical shape of the uterine cavity and the opening of the fallopian tubes, and to observe whether there is any uterine abnormality, adhesion to the uterine cavity and submucosal leiomyoma, etc., and also to observe endometrial fibroids. It can also observe the endometrial development, the presence of endometrial hyperplasia or endometrial polyps and endometrial inflammation. In this regard, hysteroscopy is the preferred examination method if there are intrauterine abnormalities such as submucosal fibroids, endometrial polyps, endometritis or uterine adhesions, etc.; 4. The staging of endometrial cancer can be judged under hysteroscopy to determine the approximate staging, and whether there is any invasion of cervical tube mucosal surface can be observed; 5. There is also another kind of multiple fibroids in uterus, and hysteroscopy is usually done in the selection of preoperative surgery to determine whether there is a combination of submucosal fibroids or not. To determine whether it is combined with submucosal fibroids, to further determine the next step in the treatment plan; 6, IUD patients in the outpatient IUD 1-2 times failed, can do hysteroscopy, to determine whether there is a ring embedded ring, ring breakage, which is the advantage of hysteroscopy; 7, if the combination of abnormal vaginal discharge, you can also do hysteroscopy.