Left-sided stomach pain appears when walking after eating, mainly due to improper diet, intestinal dysfunction, gastric ulcer, gastroenteritis, pancreatitis, sigmoid colon torsion, etc. Different treatment can be taken according to different triggers. 1, non-disease factors 1, improper diet: when patients eat spicy, cold stimulating food, will produce a certain stimulation of the gastrointestinal tract, the symptoms of abdominal pain on the left side, patients by adjusting dietary habits, avoid overeating, reduce the intake of cold, spicy stimulating food, can effectively relieve abdominal discomfort; 2, intestinal dysfunction: cold stimulation, improper diet may lead to gastrointestinal spasm, gastrointestinal function disorder, the food eaten is not easily digested and absorbed, and the accumulation in the stomach can cause abdominal distension and abdominal pain on the left side. Patients should avoid activities immediately after meals and adjust their eating habits, such as not overeating, reducing the intake of raw, cold, spicy and stimulating food, paying attention to warmth, and also apply bifidobacteria to regulate the balance of gastrointestinal flora, promote gastrointestinal peristalsis and relieve pain. Second, disease factors 1, gastric ulcer: the mucous membrane of the stomach lining is broken ulcer surface, food stimulation after eating easily cause stomach discomfort, accompanied by bloating, belching, nausea, vomiting performance. Can be under the guidance of the doctor to apply rabeprazole, pantoprazole to inhibit gastric acid secretion, bismuth potassium citrate, aluminum thioglycollate and other drugs to protect the gastric mucosa, thereby reducing discomfort; 2, gastroenteritis: if the diet is unclean leading to bacterial infection, causing gastroenteritis, can lead to symptoms of left abdominal pain, patients should promptly go to the hospital, gastroscopy, H. pylori detection, etc., can follow medical advice to use to reduce the concentration of gastric acid, promote gastric The patient can use drugs to reduce gastric acid concentration, promote gastric power, eradicate H. pylori and protect gastric mucosa, such as pantoprazole, omeprazole, ranitidine, cimetidine, aluminum hydroxide, etc., which can relieve stomach pain; 3, pancreatitis: pancreatitis is mostly acute inflammation in the clinic, and the patient will have symptoms such as pain on the left side of the abdomen after eating, and during the acute attack, temporary fasting and water fasting is required, gastrointestinal decompression, and parenteral nutrition support can be given as prescribed to relieve Symptoms; 4, sigmoid torsion: enlarged lymph nodes, tumors, cysts, etc. in the intestinal wall or mesentery can cause sigmoid torsion, resulting in left-sided abdominal pain, which generally requires surgical treatment.