Blood inside the vagina is commonly caused by the following clinical reasons: vaginal inflammation, vaginal mucosal polyps, cervical inflammation, cervical polyps, cervical epithelial lesions, cervical cancer, vaginal cancer, endometrial cancer, endometrial atypical hyperplasia, endocrine dysfunction, endometrial polyps, uterine fibroids, endometriosis, and pelvic tumors, which may all lead to vaginal bleeding clinically. Miscarriages of pregnancy, ectopic pregnancy will clinically show bleeding inside the vagina. In this case, a detailed clinical examination must be done, and a comprehensive analysis should be given in conjunction with the medical history.