The symptoms of stomach pain and discomfort when patients lie flat may be related to factors such as excessive eating, gastritis, gastric ulcer and occupying lesions in the upper abdomen. 1, excessive eating: if more food is eaten when eating, the stomach will be squeezed when lying flat, and the performance of stomach pain may occur. 2, gastritis: the symptoms of stomach pain and discomfort when patients lie flat are first considered to be caused by chronic gastritis, which may also be accompanied by indigestion, flatulence, acid reflux and other uncomfortable symptoms; 3, gastric ulcer: some patients with stomach pain symptoms when lying down may be due to gastric ulcer, especially lying down after a full meal, the symptoms of stomach pain are heavier; 4, epigastric occupying lesions: patients with gastrointestinal polyps, liver cancer, pancreatic cancer, acute cholecystitis and gastric cancer and other occupying lesions, the tumor will pull the local tissues when lying down, and if it pulls on the stomach, it may If the tumor stretches the stomach, the symptom of stomach pain may appear. When the symptoms of stomach pain appear, it is recommended that patients should go to the hospital for gastroscopy, epigastric ultrasound and other examinations to clarify the cause and treatment.