The phenomenon of hidden pain on the left side of the stomach is relatively common, and there are many reasons for it, usually from the following points to analyze: First, it is caused by constipation. The left side of the stomach is the part of the human body descending colon may have fecal matter accumulation, when the human body is constipated fecal matter is difficult to discharge will appear hidden pain. Second, gastrointestinal diseases. Like acute gastroenteritis, intestinal spasm, intestinal obstruction and so on can also lead to the left side of the stomach pain phenomenon. Third, the left side of the abdomen muscle strain. In daily life or sports accidentally strained the left side of the abdominal muscles, will also appear pain. Fourth, caused by liver disease. The liver is also present in the left side of the abdomen, and if it is a disease of the left lobe of the liver there will be pain on the left side of the abdomen. In addition, diseases of the urinary tract, the left side of the kidney, the left side of the ureter, the left side of the ovary in female patients can also lead to pain in the left side of the abdomen, so it is recommended to go to the hospital in time when there is a pain in the left side of the stomach.