McBurney's point is a point of tenderness on the body surface during an episode of appendicitis, located on the right side of the abdomen, specifically at the outer third of the line connecting the navel to the right anterior superior iliac spine. If the appendix is significantly swollen or suppurative, there will be intense tenderness and rebound pain at McBurney's point. The tenderness and rebound pain at McBurney's point are also important physical examination signs for the clinical diagnosis of appendicitis. Based on the tenderness at McBurney's point, a preliminary diagnosis of appendicitis can be made, and then, the state of appendiceal swelling can be examined by abdominal ultrasound to choose a systematic treatment based on the results.