Return of menstruation often refers to the occurrence of vaginal bleeding after menopause, and the duration of menopause is more than six months. This condition is commonly caused by the following reasons: first, to exclude the possibility of endometrial cancer, ultrasound examination is needed. If the thickness of endometrium is more than 0.5cm, endometrial thickening is considered in this case, and diagnostic scraping should be done, and treatment should be carried out according to the result. The second one, lesions of the cervix. For example, cancer of the cervix and polyps of the cervix can cause vaginal bleeding, and cervical cancer screening is needed. In addition, due to the decline in ovarian function and estrogen levels, you can get senile vaginitis. Age-related vaginitis is characterized by bleeding spots on the vaginal mucosa, which can also lead to vaginal bleeding due to capillary rupture, so it is important to find out the cause of the bleeding before treating it.