The presence of uterine fluid after menopause may be caused by endometritis or other lesions of the endometrium. 1. Endometritis: If postmenopausal women do not pay attention to cleanliness during sex, it will cause infection by bacteria and other pathogens, bleeding endometrial inflammation, and the inflammatory secretion produced will stay in the uterine cavity, which will lead to uterine cavity effusion. 2. Other endometrial lesions: atypical hyperplasia of the endometrium, complex hyperplasia of the endometrium, or endometrial cancer may cause uterine effusion, which indicates that there is abnormal bleeding in the uterus, and may be accompanied by vaginal bleeding at this time. In addition, there are other causes of fluid in the uterus after menopause. If you have fluid in the uterus after menopause, it is recommended that you go to the hospital in time to avoid delaying your condition.