A 6mm thick endometrium after menopause is not normal. The thickness of the endometrium should be less than 4mm and 6mm is relatively thick. In case of irregular vaginal bleeding, a diagnostic scraping procedure is needed to scrape out the endometrium for pathological examination, or a hysteroscopy, where special instruments are used to enter the uterine cavity through the cervix to observe the condition of the uterine cavity. If abnormalities are found, such as the presence of endometrial polyps or endometrial hyperplasia, an electrosurgical ring is applied to remove the abnormal tissue, a pathological examination is done to clarify the diagnosis, and based on the pathology, the next treatment plan is decided. If the endometrium is 6 mm thick and there are no clinical symptoms, it can also be reviewed after 3 months. If the endometrial thickness continues at 6mm without growth or atrophy and thinning, regular ultrasound monitoring is sufficient. If the endometrium is found to continue to grow and thicken, a diagnostic curettage or hysteroscopic surgery will be required.