Vaginal bleeding similar to the amount of menstruation during non-menstrual period may be caused by pre-menstrual abortion after pregnancy, uterine fibroids, endometrial polyps, endometrial cancer, cervical cancer and so on. 1. Pre-eclampsia: If women of reproductive age who have had sexual intercourse experience vaginal bleeding after menopause, it may be a sign of pre-eclampsia. 2. Uterine fibroids: Vaginal bleeding similar to the amount of menstruation that occurs when a woman is not menstruating may be caused by uterine fibroids. Uterine fibroids can sometimes cause abnormal vaginal bleeding, increased menstrual flow and prolonged menstrual period. 3. Endometrial polyps: Vaginal bleeding similar to menstrual bleeding during non-menstrual periods may also be caused by endometrial polyps. Since endometrial polyps are brittle, if they break and bleed, vaginal bleeding during non-menstrual period may occur. 4. Endometrial cancer, cervical cancer: If vaginal bleeding similar to menstrual bleeding occurs suddenly during non-menstrual period, endometrial cancer, cervical cancer and other malignant diseases need to be alerted. There may be other reasons for vaginal bleeding similar to menstruation during non-menstrual period, 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 under the guidance of the doctor.