Stomach pain after painless abortion is mostly caused by uterine contraction, which helps the open small blood vessels in the uterine cavity to close and reduce uterine bleeding. In addition, oral antimicrobials and new biochemical granules after abortion can help prevent intrauterine infection and discharge of blood accumulated in the uterine cavity. If you still have stomach pain after three days after the abortion, you should go to the hospital for further examination and ultrasound to rule out incomplete abortion. If there is intrauterine residue, further purging is needed, blood tests are performed to rule out intrauterine infection, and antimicrobial treatment is applied as appropriate.