If sudden vaginal bleeding occurs during non-menstrual period, there are several possibilities: 1. Some women have vaginal bleeding after menstruation, which may be due to ovarian dysfunction, endometrial polyps, etc., such as mid-menstrual bleeding may be ovulatory bleeding, which requires gynecological ultrasound internal examination and hormone testing if necessary. 2. Some women have delayed menstruation or sudden vaginal bleeding when they are about to have menstruation, which may be due to ectopic pregnancy. If a pregnant woman has sudden vaginal bleeding, she should go to the obstetrics and gynecology department for a gynecological examination and ultrasound examination of the uterus and adnexa to confirm whether she has ectopic pregnancy, and after the diagnosis, she should be given the appropriate treatment measures in time, and if necessary, surgery to avoid heavy bleeding. 3.