Bleeding again 12 days after abortion can be physiologic or pathologic. If it is physiological, no intervention can be made; if it is pathological, it should be treated accordingly. The common causes are incomplete abortion, cervical polyps and so on. 1. Physiological conditions: vaginal bleeding time after abortion is usually about 2 weeks, so bleeding again 12 days after abortion may be a normal phenomenon, if the ultrasound suggests that there is no abnormal echo in the uterine cavity, can be observed dynamically, not to be dealt with. 2. Incomplete abortion: there may be residual embryonic tissue, the bleeding mechanism is residual embryonic tissue as a foreign body, stimulate the uterus to contract and cause bleeding, at this time need to do ultrasound to confirm the diagnosis, after the diagnosis of the timely operation of the uterus to prevent hemorrhage, and give antibiotics to prevent infection after the operation. 3. Cervical polyps: by the cervical glands, mesenchyme and blood vessels composed of superfluous organisms, larger polyps will occur irregular vaginal bleeding, can be carried out in aseptic operation polyp removal, followed by vaginal stuffing gauze compression to stop bleeding, 24 hours later removed, and will be sent to the removal of the material to confirm the diagnosis of the disease. There may be other reasons for bleeding 12 days after abortion, so you should go to the hospital in time and do relevant examinations to clarify the cause and guide the treatment.