Appendicitis patients may have left lower abdominal pain mainly due to the following reasons: First, the appendix originates from the root of the cecum, will change with the location of the cecum and change, and even sometimes the appendix is in the left lower abdomen, so the occurrence of acute appendicitis will appear in the left lower abdominal pain. Second, severe acute appendicitis will produce peritonitis, thus appearing in other parts of the pain, serious gangrenous and perforated appendicitis will appear in the whole abdomen pain, pressure, rebound pain is obviously unbearable, so there will be the pain of the left lower abdomen, this time, only through the operation can achieve curative treatment.