The anatomic site of acute appendicitis is not a single fixed location, and symptoms of appendicitis may occur in multiple locations. In normal cases, the body projection is at the intersection of the umbilicus and the external and external 1/3 of the anterior superior iliac spine line, where pressure pain and rebound pain can be present. Specially located appendicitis, for example, can be medial, but at the same time can extend below the umbilicus or laterally, down to the pelvis, up to the right subcostal area, and backward to the posterior appendix. Therefore, the location of the appendix is more variable and is usually located at the point of McKay.