A year after menopause and menstruation is an abnormal phenomenon, mainly related to three factors, including: 1, vaginal, cervical and endometrial diseases, after menopause accompanied by a decline in estrogen levels, there will be varying degrees of atrophic vaginitis. If the local mucous membrane is thin, spot vaginal bleeding will occur.2. Cervical erosion, cervical inflammation, pre-cancerous lesions of the cervix or even cervical cancer can also cause vaginal bleeding after menopause, so regular cervical cancer screening in the obstetrics and gynecology department should be performed after menopause.3. Irregular shedding of endometrial lining, proliferation, polyps, or even malignant tumors in the endometrial lining are the main causes of vaginal bleeding after menopause.