I. Precautions before hysteroscopy 1. Hysteroscopy is best performed 3 to 7 days after menstruation. Because of the thin endometrium, less mucus and bleeding during this period, the uterine cavity lesions are easy to see. Patients with irregular bleeding can be examined at any time after hemostasis, and antibiotics are given to prevent infection if necessary. 2, should not be examined during pregnancy to avoid adverse consequences. 3.The examination should not be performed when there is acute genital inflammation to prevent the spread of inflammation. 4, in the lesion activity or bleeding is also not suitable to do the official cavity examination. 5. When endometrial cancer has been identified, the examination should not be performed to avoid the spread of cancer. Precautions after hysteroscopy 1. There may be a small amount of bloody vaginal discharge within 2-7 days after the examination. Keep the perineum clean after hysteroscopy. Prohibit sexual intercourse and bathing for two weeks after the operation to prevent infection, because the official opening is not yet closed tightly during this period and bacteria can easily invade. 3.After the examination, give antibiotics to prevent infection if necessary and treat the original disease.