Under normal circumstances, postmenopausal women do not experience vaginal bleeding anymore, but if postmenopausal women experience vaginal bleeding, it should be taken seriously. For example, malignant tumors such as cervical cancer and endometrial cancer can cause irregular vaginal bleeding after menopause. Of course, not all vaginal bleeding is caused by malignant tumors, so there is no definite answer to the chance of cancer in postmenopausal bleeding. Because of the rapid decrease of estrogen level in women after menopause, the endometrium is less resistant to various bacterial infections that can cause inflammation of the endometrium, resulting in superficial capillary bleeding. The presence of severe cervical erosion or cervical polyps may also lead to bleeding after menopause. These bleeding phenomena are benign lesions and can be completely cured with medication. However, if the bleeding is caused by cervical cancer or endometrial cancer, it cannot be cured by normal treatment and can only be treated by surgery with radiotherapy or chemotherapy. Therefore, postmenopausal women who have vaginal bleeding must go to the hospital in time to have relevant examinations, such as ultrasound, electronic colposcopy and pathological examination of the lesion to determine whether it is caused by cancer.