Abdominal pain 3 days after abortion may be caused by uterine contraction, infection, tissue residue and other reasons. 1. Uterine contraction: After abortion, as the uterus gradually recovers and the residues in the uterine cavity are gradually discharged, the uterus will undergo natural contraction. 2. Infection: If there is infection after abortion, it may be manifested as persistent swelling and pain in the lower abdomen, and may be accompanied by fever, increased vaginal discharge and other phenomena. 3. Tissue residue: If some pregnancy tissue remains in the uterine cavity after abortion, it will affect the recovery of the uterus, and there will be pain in the uterus, which will be manifested as pain in the lower abdomen and may be accompanied by vaginal bleeding. If you have abdominal pain after abortion, accompanied by fever, bleeding and other uncomfortable symptoms, you should go to the regular hospital in a timely manner, to clarify the cause of the disease, under the guidance of professional doctors to take targeted treatment.