Hysteroscopy is a fiberoptic light source endoscope used for intrauterine examination and treatment, and is a new, minimally invasive gynecologic treatment technique. The greatest advantage of hysteroscopy is that it not only determines the site, size, appearance and extent of the presence of the lesion, but also provides a detailed observation of the tissue structure on the surface of the lesion. It is also possible to take material or position the uterus for scraping under direct vision. It greatly improves the accuracy of the diagnosis of intrauterine diseases, and updates, develops and makes up for the shortcomings of traditional treatment. It is the examination method of choice for gynecological bleeding disorders and intrauterine lesions. It has unique advantages especially in the examination of uterine infertility. Doing hysteroscopy is getting more and more attention, and many patients, especially women suffering from infertility, want to know what to do for hysteroscopy. It is important to be prepared before the examination and to pay more attention after the examination in order to ensure the results of the procedure. Precautions before hysteroscopy: 1. Hysteroscopy is generally best performed within 3 to 7 days after menstruation. Because the endometrium is thin during this period, mucus and bleeding are less, and the uterine cavity lesions are easy to see. Also it is not easy for the overly thick endometrium to enter the abdominal cavity through the fallopian tube. 2. Sexual intercourse is prohibited after menstruation or 3 days before surgery. 3.If necessary, the doctor will remind you to hold urine properly before the operation to facilitate the ultrasound monitoring during the operation. 4.The following preoperative tests should be done as needed: infectious disease test (Hepatitis B surface antigen, HIV HCV RPR), liver function, kidney function, electrocardiogram, blood and urine routine, four coagulation tests, white belt routine, etc. 5.Blood pressure, pulse and temperature should be taken before the operation to understand the heart and lung condition and vaginal cleanliness. 6.The examination should not be performed during pregnancy to avoid adverse consequences. 7.The examination should not be performed when cancer in the uterus has been diagnosed to avoid the spread of cancer cells. 8.Checking is not recommended when there is acute genital inflammation to prevent the spread of inflammation. 9.Usually, hysteroscopy is not recommended when the lesion is active or bleeding. Unless there is a medical need. Precautions after hysteroscopy: 1. There may be a small amount of bloody vaginal discharge within 2-7 days after the examination, do not worry too much. 2. Keep the perineum clean after hysteroscopy and do not have intercourse or take a tub bath for two weeks to prevent infection. Because the opening of the uterus has not closed tightly during this period, it is easy for bacteria to invade. 3. Give antibiotics to prevent infection and treat the original disease if necessary after the examination. Note: Hysteroscopy is usually painless, and the patient only feels distension or vague pain in the lower abdomen during the examination, but it is tolerable. Block anesthesia or intravenous anesthesia can also be used for patients who are more nervous or need microscopic surgery.