The pain in the stomach three months after cesarean section may be related to pelvic inflammatory disease, intrauterine residue, incision hematoma and other factors, which need to be treated with medication, purging, and secondary surgery. 1. Pelvic inflammatory disease: after cesarean section, the maternal body is relatively weak, the pelvic tissue is susceptible to bacterial and microbial infections caused by inflammation, there will be a cesarean section three months after the stomach ache symptoms. It can be treated with antibiotics such as ofloxacin and metronidazole, and attention to rest. 2. Intrauterine residue: The pain in the stomach three months after cesarean section may be caused by part of the fetal membranes remaining in the uterine cavity during the cesarean section, which needs to be cleared. 3. Hematoma of incision: the pain in the stomach three months after cesarean section may be caused by improper wound suture, infection and hematoma, resulting in stomach pain and other symptoms, requiring a second operation. Three months after the cesarean section inside the stomach pain symptoms are serious, may also be related to other factors, should go to the regular hospital in a timely manner, by the doctor’s guidance to determine the treatment plan.