Non-menstrual bleeding is vaginal bleeding that does not occur during menstruation. There are various causes of non-menstrual bleeding in women, including traumatic bleeding, medications, functional uterine bleeding, systemic diseases, cervical cancer, endometrial cancer, cervical erosion, cervical polyps, and acute pelvic inflammatory disease that may cause non-menstrual bleeding. Traumatic bleeding generally refers to hymen rupture, vaginal wall rupture, and posterior vaginal fornix rupture can all cause women to bleed during non-menstrual periods. Improper drug use can also cause non-menstrual bleeding, especially when taking emergency contraceptives or hormonal drugs such as progesterone or Glivec, which can cause endocrine disruption and lead to non-menstrual bleeding. Functional uterine bleeding, which is actually also caused by endocrine disorder, will result in heavy vaginal bleeding and bright red color. Some systemic diseases of the blood, such as aplastic anemia, disseminated intravascular coagulation, and liver disease may also cause women to bleed during non-menstrual periods. People with cervical cancer and endometrial cancer may also experience non-menstrual bleeding in the early stages of the disease, but it may be accompanied by other abnormalities such as foul-smelling discharge and severe pain in the lower abdomen. In addition, cervical erosion, cervical polyps and acute pelvic inflammatory disease are also factors that cause non-menstrual bleeding. In short, the causes of non-menstrual bleeding in women are many, and it is recommended to go to the hospital in time to do relevant examinations to identify the cause and treat it in time, otherwise the damage to the body is very great.