The reasons for menopause one year after menopause and menstruation are mainly the following: 1. It may be because the ovaries still have some residual secretion of sex hormone function, menstruation is produced because of endometrial thickening, shedding and bleeding, endometrial thickening and shedding and bleeding are regulated by the ovaries’ secretion of estrogen and progesterone. In postmenopausal women, ovarian atrophy, functional decline, and extremely low hormone secretion cannot stimulate the endometrium to undergo cyclical thickening, shedding, and bleeding, thus causing menopause. There are many gynecological diseases that cause bleeding, such as precancerous cervical lesions, cervical cancer, endometrial cancer, complex hyperplasia of the endometrium, severe senile vaginitis, uterine cavity infection, etc., which may damage the uterine cavity, cervix or vaginal mucosa and cause bleeding, in fact, these bleeding are not menstruation, which is a pathological condition. You need to go to a gynecological clinic combined with the results of vaginal examination, ultrasound examination, etc., to further determine what the cause is.