The most common causes of vaginal blood are as follows: first, chronic inflammation of the cervix, which leads to brittle local tissues and the appearance of blood; second, precancerous lesions of the cervix itself, or cervical cancer, which leads to vaginal blood, and screening for cervical cancer is recommended; third, due to inflammation of the endometrium, which makes the tissues fragile, so that irregular shedding can occur and cause vaginal blood; fourth, due to endocrine disorder, the endometrium appears to shed asynchronously and there will also be vaginal blood. Therefore, if you have vaginal blood, it is recommended to have a detailed examination to understand what part of the vagina the blood comes from, and then you can treat it.