I. Endometrial injury (a) Confirmation of endometrial injury Endometrial thickness <8 mm at follicular maturity (follicle diameter ≥18 mm or estradiol 200 pg/ml) during natural cycle Hysteroscopy reveals large endometrial defects and scarring (concurrent management: separation of adhesions and placement of IUD for 3 months). (ii) Treatment of endometrial damage High dose estrogen to stimulate endometrial growth: Tegretol 5mg twice daily (or 3-6mg 3 times daily) for 15 or 30 days with ultrasound. Longest: Tocopherol 3-6mg, 3 times daily for 3 months, followed by progesterone for 10 days. Second, endometrial thickening (thickness greater than 16mm) 1, does not necessarily mean endometrial lesions 2, if the endometrial morphology is normal, regular menstrual cycle, menstruation can be clean in 7-8 days, does not require scraping. 3, if the menstruation is not normal, the morphology of the endometrium is not normal on ultrasound, and the echogenicity is uneven, it needs to be scraped and sent to pathology for further treatment. Endometrial polyps 1, WHO definition: benign nodules protruding from the surface of the endometrium due to endometrial glands and fibrotic endometrial mesenchyme containing thick-walled blood vessels. 2.Pathogenesis: It is believed that it is mainly due to the imbalance of hormonal expression in local tissues, and generally has no malignant tendency. 3, clinical: if there are no symptoms, can not be dealt with, polyps like endometrium can be seen in all stages of the endometrium, if the diameter of less than 2 cm on the pregnancy has no effect, greater than 4 cm certainly has an impact.