Hysteroscopy mainly examines the following: 1. to check the morphology of the uterus, the normal morphology of the uterus is inverted triangle, hysteroscopy can check whether the uterus has any developmental abnormality, whether there is longitudinal septum in the uterine cavity, whether the endometrium is adherent, whether the opening of bilateral fallopian tubes is normal, etc. 2. to check the endometrial occupying lesions, such as whether there are endometrial polyps and submucosal myomas. 3. to check the thickness of the endometrium. 4.Some biopsies in the uterus can be removed using hysteroscopy, such as endometrial cancer, which can be seen under the microscope and a part of the tissue can be taken for pathological examination, which can further clarify the diagnosis. 5.Surgical treatment can be done under hysteroscopy, such as separation surgery of endometrial adhesions, treatment of endometrial polyps, etc. After doing hysteroscopy, you should pay attention to keep your vulva clean and fresh to avoid infection.