Why does abdomen still ache faintly sometimes after appendicitis operation 3 years

Three years after appendicitis surgery, the abdomen sometimes still has dull pain. This may be because the appendix was not completely cut off during the operation, resulting in appendix stump. The patient often has diarrhea or constipation. Unreasonable diet can lead to appendix stump inflammation in the long run, so there will be repeated Pain in the right lower abdomen.