Left abdominal distension may be caused by physiological factors or symptoms of certain diseases, such as stomach lesions, intestinal diseases or pancreatic diseases. 1. Physiological factors: If you eat too much gas-producing food, such as potatoes, onions, soy foods, etc., it will cause excessive gas production in the intestines, resulting in abdominal distension. 2. Pathologic factors: (1) Stomach lesions: mainly due to Helicobacter pylori infection, autoimmune factors and physical factors that cause stomach diseases, which can lead to acid reflux and left abdominal distension and other symptoms. (2) Intestinal diseases: Long-term poor diet, long-term smoking and genetic factors may induce intestinal diseases, which may cause left abdominal flatulence and defecation difficulties. (3) Pancreatic diseases: Pancreatic diseases caused by biliary tract infections and other factors may also cause left abdominal distension and gas. However, it cannot be ruled out that it is caused by other factors. It is recommended that the patient consult a doctor in time to find out the cause of the disease, and after the doctor clarifies the cause of the disease, the patient will be given targeted treatment.