If the endometrium is 18mm thick, it is a benign lesion such as endometrial thickening caused by hormone disorder or endometrial thickening caused by endometrial polyp, which can be cured. If it is cancerous, it is more serious and needs surgery and radiotherapy. 1. Hormone disorders, endometrial polyps: If the endometrial thickness of 18mm is caused by hormone disorders in the body, it can be relieved by oral hormone drugs under the guidance of the doctor, and it is necessary to go to the hospital for rechecking at intervals, and if the thickness of the endometrial lining is still too thick, it can be treated by scraping the uterus. If endometrial thickening is caused by endometrial polyps, the endometrial polyps can be removed under hysteroscopy. 2. Cancer: if the endometrium reaches 18mm after menopause, it is necessary to do diagnostic scraping and take the endometrial tissue for pathological examination to see if it is endometrial cancer. If the endometrial thickening is caused by cancer, it is necessary to perform surgery immediately, and then it is necessary to choose radiotherapy or chemotherapy according to the condition. For the same disease, patients with different physical conditions and different stages of the disease have different treatment methods, and standardized treatment should be carried out under the guidance of doctors.