Painless abortion stomach pain may be due to uterine contraction, intrauterine residue, postoperative infection and other reasons. 1. Uterine contraction: stomach pain after painless abortion is usually caused by uterine contraction, uterine contraction usually helps the blood vessels in the uterine cavity to close, which can reduce uterine bleeding to a certain extent, usually a normal phenomenon, if the patient’s symptoms are more serious or the pain is prolonged, you should go to the hospital to do further examination. 2. Intrauterine residue: if the patient has a large fetus or a special uterine morphology, the embryonic tissues and accessory tissues may not be completely suctioned out during the operation, so there will be intrauterine residue, causing abdominal pain and bleeding. 3. Post-operative infection: If you don’t pay attention to hygiene after the operation, reproductive tract infection and pelvic inflammatory disease may occur, resulting in stomach pain. It is suggested that patients should closely observe their own recovery, and also go to the hospital immediately if malignant changes in the condition occur.