The causes to be considered include physiological factors, gastric diseases, neurosis and so on. 1. Physiological factors: when the patient overeating, the stomach is in a state of fullness, at this time if you take a sitting position will be conscious of the epigastric hidden pain and other symptoms, lying down to a certain extent to reduce the burden on the stomach, thus relieving the symptoms. 2. Stomach diseases: including gastritis, gastric ulcer and so on. At the onset, there will be a vague pain in the left upper abdomen, lying down may reduce the symptoms. The diagnosis can be confirmed by gastroscopy. 3. Neurosis: there will be vague pain in the upper abdomen at the onset of the disease, lying down may reduce the symptoms, perfect auxiliary examination has no obvious abnormality. It is recommended that patients who are not feeling well should go to the hospital in time to have the cause of the disease identified and then treated.