Clinically, according to the severity of appendiceal infection, the pain performance of patients will be different, as follows: a. Acute simple appendicitis, the degree of appendiceal infection is relatively mild, which can only be manifested as a vague discomfort in the right lower abdomen, the pain symptoms are very mild, and there may be no obvious rebound pain. Acute suppurative appendicitis, early manifestation of the upper abdomen or around the navel tugging pain, with the passage of time is progressive aggravation of the appendix, the site of pain can gradually shift to the right lower abdomen, and the right lower abdomen fixed pressure rebound pain, which is one of the more typical signs to diagnose appendicitis. Third, acute gangrenous appendicitis, because the appendix has been perforated, the bacteria and fecal fluid in the appendix can infiltrate into the abdominal cavity causing severe pain and abdominal muscle tension in the right lower abdomen, at this time, even if analgesic drugs are given, the pain symptoms often cannot be completely relieved, and timely surgery is needed to remove the appendix and clean the abdominal cavity in order to make the condition recover faster.