Abdominal pain in urination after appendectomy may be due to postoperative scarring, or it may be caused by, for example, infection of the urinary tract, intestinal obstruction, and so on. Intra-abdominal scarring caused by the surgical incision during appendectomy, irritation of the gastrointestinal tract from the surgery, incomplete recovery of the surgical wound after the surgery, etc., may lead to irritation of other organs, resulting in the symptom of abdominal pain when urinating after the surgery. Excessive pus outflow during appendiceal lesions, perforation causing irritation to the bladder, and irritation to the urethra from the indwelling catheter after the surgery can lead to infection of the urinary system, which can cause irritation to the bladder when urinating, thus manifesting the symptom of abdominal pain when urinating. The appendix surgery process can lead to adhesion of the intestinal tube, edema, resulting in intestinal obstruction, and pain during urination and defecation. When the patient feels sick, he should go to the hospital immediately.