Sleeping supine stomach pain may be duodenal ulcer, stomach cramps, reflux esophagitis and other disease factors. 1. duodenal ulcer: sleep at night is usually in the fasting state, fasting stomach acid concentration increases can stimulate the ulcer wounds lead to sleep supine stomach pain symptoms. Oral acid-suppressing drugs such as omeprazole and gastrointestinal mucosal protectants such as teprenone should be taken under medical supervision. 2. Stomach cramps: If you don’t pay attention to keep your stomach warm when you sleep on your back, the cold in your abdomen will cause stomach cramps, resulting in stomach pain when you sleep on your back. Pay attention to keep the stomach warm, avoid overeating and other stimuli. 3. Reflux esophagitis: It is mainly caused by the reflux of gastroduodenal contents into the esophagus, and the symptoms of reflux and heartburn can be seen when lying on the back, accompanied by epigastric pain, epigastric burning sensation and other symptoms. In severe cases, oral acid-suppressing drugs such as omeprazole are needed, and the head of the bed needs to be elevated when sleeping at night. It is recommended to go to the hospital if you have symptoms of stomach pain when sleeping on your back, so that your doctor can determine the cause of the problem.