It’s been 3 years since the cesarean section and you can still feel a hard lump inside. If there are no uncomfortable symptoms, then it’s usually normal and may be caused by scarring. If there is pain and other symptoms, it is not normal, may be caused by endometriosis. 1. Keloid hyperplasia: When the patient develops the symptom of hard lumps in the abdomen 3 years after cesarean section, if there are no other uncomfortable symptoms, most of them are normal phenomena. This condition is mostly considered to be caused by keloid hyperplasia, and the incision of the patient’s cesarean section will be harder than other tissues. 2. Endometriosis: The cause of endometriosis has not been fully clarified, and it is considered to be related to the endometrial implantation theory. Patients may have symptoms such as dysmenorrhea, acute abdominal pain, abnormal menstruation, etc. This is abnormal and mostly caused by the patient’s endometrium having ectasia in the abdominal wall. If patients experience discomfort after cesarean section, it is recommended that they go to the hospital in time for examination, clarify the cause of the disease and follow the doctor’s instructions for treatment.