The left side of the stomach bloating pain is mainly considered may be caused by gastrointestinal dysfunction, intestinal obstruction, intestinal occupational lesions and other diseases. 1. Gastrointestinal dysfunction, due to the peristaltic dysfunction of gastrointestinal or irregular excessive contraction of intestinal smooth muscle, the blood vessels of the intestinal wall are squeezed and transient ischemia occurs, and the signal of ischemia will stimulate the parasympathetic nerves to produce excitation, which can cause abdominal pain symptoms. 2. Intestinal obstruction, intestinal obstruction patients due to the uncoordinated movement of the intestinal wall or narrowing of the intestinal lumen, intestinal contents can not pass through the intestinal tract, a large number of gases and intestinal contents, etc. gathered in the upper end of the obstructed intestinal tract, resulting in excessive dilatation of intestinal tubes, thus causing abdominal pain. 3. Intestinal or abdominal tumors, small bowel cancer, abdominal tumors and other abdominal space-occupying lesions in patients due to the stimulation of intestinal tract or peritoneum by the mass can also appear abdominal pain, flatulence symptoms. If the left side of the stomach is not relieved for a long time, it is recommended to go to the hospital in time, improve the colonoscopy, barium meal, standing abdominal plain film and other examinations to clarify the cause of the disease and choose the appropriate treatment program.