The most common cause of stomach pain at night is duodenal ulcer. The performance of duodenal ulcer is mainly pain when hungry, pain at night, which is more unique pain performance of duodenal ulcer, when the typical night pain symptoms, need to go to the hospital in time for examination, gastroscopy is needed to clarify whether there is a duodenal ulcer. If the test is clear that duodenal ulcer is present, you need to come for regular treatment.