The reason for the vague pain in the left upper abdomen alerting the pancreas is that pancreatic lesions are rare compared to gastric disorders. The most common diseases are gastritis, gastric ulcer, pancreatitis and splenic abscess, etc. The most common diseases are gastritis and gastric ulcer, and the first thing to consider is that the pain in the upper left abdomen is caused by gastritis and gastric ulcer, and the checkups are for the stomach, such as gastroscopy, etc. If there is no abnormality in the examination, then you need to be alert for pancreatic lesions. If there is no abnormality in the gastric examination, it is necessary to be alert to whether the pancreas is diseased, and sometimes it is necessary to carry out ultrasound, CT and other examinations to determine. It is also possible to have gastric problems accompanied by pancreatic lesions. The left upper abdominal pain should be timely to the regular hospital, the doctor according to the symptoms, signs and auxiliary examination to determine the specific cause of the disease, according to the cause of the disease to give the correct treatment.