Most appendicitis can be diagnosed by typical clinical symptoms, physical examination and ancillary tests. The most important manifestation of acute appendicitis is typical, metastatic right lower abdominal pain, with pressure pain and rebound pain at the right lower abdominal McKay’s point, which is the junction of the umbilicus and the outer and outer 1/3 of the right anterior superior iliac spine, with or without upper gastrointestinal symptoms such as nausea and vomiting, and systemic symptoms such as chills and fever. Ultrasound may indicate an enlarged appendix or even fluid exudate around it. CT is only used to detect appendicitis with surrounding inflammatory masses or abscesses. With the above typical clinical symptoms, signs and ancillary tests, it is not difficult to detect and confirm the diagnosis of appendicitis.