Appendicitis surgery may lead to peritonitis if it causes abdominal infection. Appendicitis is mainly treated by appendectomy, which is mostly curable. Some patients may have complications, such as pus infection of the incision and perforation of the appendix, which may cause abdominal infections that may lead to peritonitis. Patients who have abdominal pain, nausea, vomiting, fever and other symptoms after appendicitis surgery may cause peritonitis and should have an abdominal ultrasound examination. If the diagnosis is confirmed, anti-infection treatment should be carried out in time, and in serious cases, surgical treatment should be adopted, and abdominal lavage and drainage should be carried out. Therefore, when performing appendicitis surgery, aseptic operation should be ensured to prevent gastrointestinal fluid from spilling out and causing peritoneal infection. The resulting peritonitis can usually be avoided if the appendicitis surgery is performed properly. Patients with appendicitis should go to the regular hospital in time, under the guidance of the doctor for surgical treatment, so as not to delay the condition.