The common causes of clinical pain in the left upper abdomen include the following: 1. The most common is acute gastritis or superficial gastritis or erosive gastritis, which manifests as pain and discomfort in the upper abdomen and usually requires further gastroscopy for a clear diagnosis. The treatment is mainly conservative, usually using acidulants and, if necessary, auxiliary antibiotics. 2. The more common cause of the disease is mainly acute pancreatitis, including binge drinking or alcohol-induced pancreatitis. The most common cause in China is biliary pancreatitis caused by cholecystitis or common bile duct stones, which usually requires further CT examination to clarify the diagnosis, and treatment is mainly symptomatic treatment such as growth inhibitors to inhibit pancreatic enzyme secretion. 3. or CT examination, and even surgery if necessary.