Left side of the body pain, the common causes are the following: a. gastric perforation with acute diffuse peritonitis, the stomach is located in the upper left abdomen of the body, once the gastric perforation, gastric contents will seep into the abdominal cavity causing acute abdominal manifestations, the patient will have significant pain on the left side of the body. At this time, surgery is needed as soon as possible to repair the perforation and improve the patient’s pain symptoms. Spleen rupture, the spleen is located in the left posterior side of the body, when traumatized the spleen rupture bleeding, can cause pain symptoms on the left side of the body. In this case, the patient needs to undergo emergency surgery to remove the spleen, control the bleeding and save life. Third, the left kidney stone causes pain, the left kidney stone embedded in the ureteral outlet will cause severe pain, the patient will be accompanied by nausea, vomiting and other gastrointestinal symptoms. At this time, the stone can be shattered by extracorporeal impact lithotripsy and discharged out of the body along with urine to solve the patient’s pain.