The pain inside the incision after appendicitis surgery includes the following causes: 1. It may be normal post-operative pain of the incision after appendectomy, mainly due to the fact that after the traditional open surgery, the skin surface and the deep muscles, tendon membranes and nerves are separated, and the post-operative pain of the incision is a normal post-operative reaction. 2. As the incision has become infected, the site of infection is below the fat layer, above the fascia Above the incision, it may lead to painful swelling inside the incision, accompanied by local redness, swelling and fever. In this case, the stitches should be removed in time to drain the purulent exudate, which will help to promote the prevention of infection in the incision and enable complete healing. 3, it may be due to the reaction of surgical sutures or foreign bodies wrapped in threads or granulomas, which may cause pain inside the incision, which can be treated with local microwave physiotherapy and symptomatic support, which may reduce pain.