Usually the normal endometrial thickness is 5-10 mm. The thickness of the endometrium varies at different times and ages. Normally, the ovaries function normally before menopause. The menstrual cycle is divided into a proliferative phase, a secretory phase, and a menstrual phase. The endometrium is about 9-10 mm during the proliferative phase, 5-6 mm during the secretory phase, and 8-10 mm during the menstrual phase. after a woman has just become pregnant, the endometrium is about 10 mm thick. After menopause, the endometrium becomes significantly thinner, with 5mm being the threshold, and >5mm being considered as endometrial thickening, while <5mm is considered normal. Usually, if there is a thickening of the endometrium, the cause should be identified and treated. First of all, hysteroscopy should be done, regardless of whether there is a uterine polyp or not, the uterus should be routinely scraped comprehensively, and the scrapings should be sent for pathological examination to clarify whether there is endometrial lesion. If endometrial polyps are seen under hysteroscopy, endometrial polyps should be removed and sent for pathological examination after removal to clarify the diagnosis and then treat the symptoms.