There are more reasons for small amount of non-menstrual vaginal bleeding, which may be caused by ovulation bleeding, endocrine disorders, cervical polyps, cervical cancer and so on. 1. Ovulation bleeding: patients with small amount of non-menstrual vaginal bleeding may be ovulation bleeding, this type of bleeding, the amount of bleeding is often not much. 2. Endocrine disorders: a small amount of vaginal bleeding during non-menstrual period may be caused by endocrine dysfunction due to mental and psychological factors, so that women do not have a small amount of vaginal bleeding without menstruation. 3. Cervical polyps: small amount of vaginal bleeding during non-menstrual period may be caused by the rupture of cervical polyps, which varies greatly according to the amount of ruptured polyps. 4. Cervical cancer: if women experience small amount of vaginal bleeding after sexual intercourse or transvaginal operation, they need to consider the possibility of cervical cancer. Small amount of vaginal bleeding during non-menstrual period may have other reasons, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.