Black blood appears again 10 days after abortion, this situation is not normal, it may be incomplete abortion, or poor uterine regeneration, or endometrial infection caused by abortion, endometrial inflammation of the cause, so it is necessary to go to the hospital immediately for ultrasound examination. If it is an incomplete abortion, the uterus needs to be cleared again to avoid heavy bleeding or infection in the uterine cavity. If there is no residue in the uterine cavity and there is fluid in the uterine cavity, it may be caused by infection in the uterine cavity or poor recovery of the uterus, and anti-inflammatory drugs and drugs to promote uterine contraction need to be applied and full course of treatment should be carried out because the inflammation caused by the miscarriage is very easy to cause pelvic inflammatory disease.