Vaginal bleeding refers to vaginal bleeding, which may be caused by normal menstruation, menstrual disorders, vaginitis and other factors. 1. Normal menstruation: in case of adolescent women, it is mostly due to entering physiological maturity, which may be the normal onset of menstruation, which is one of the outward signs of maturity of female reproductive function. 2. Menstrual disorders: Many women may have irregular and intermittent vaginal bleeding due to endocrine disorders, mental factors and other causes of menstrual disorders. 3. Vaginitis: When the patient has vaginitis, it may lead to proliferation of vaginal tissues and growth of polyps on vaginal mucosa. Because the polyp tissue is fragile, it is easy to rupture and bleed, and vaginal bleeding occurs. In addition, vaginal bleeding may also be caused by other reasons, such as pelvic inflammatory disease, birth control ring displacement, etc. It is recommended that the patient consult a doctor in a timely manner to clarify the cause of the disease and treat the symptoms.