The causes of left small stomach pain may be: 1, acute gastritis and peptic ulcer patients with excessive secretion of gastric acid, stimulating the gastric mucosa or after eating can cause abdominal pain; 2, acute pancreatitis and pancreatic cancer may be related to the capsule tension caused by pancreatic edema, usually pain occurs after drinking or overeating; 3, intestinal torsion, intestinal overlap, colorectal cancer can also cause abdominal pain due to obstruction, the left side of the stomach pain should be promptly to the hospital to do Relevant examinations, such as gastroscopy and colonoscopy, should be carried out to clarify the causes and treat the symptoms. In addition, if it is female, gynecological problems can also be ruled out. If there are urinary stones, there may also be pain, but not necessarily on the left side, and urinary stones need to be examined by ultrasound and contrasted if necessary. If the treatment is caused by enteritis, antibiotics can be used in combination with probiotic conditioning, so there are many reasons for the small stomach pain on the left side.