The stomach bloating at night is fine during the day, considering that it may be related to diet, spirit and other physiological factors, and chronic gastritis, duodenal ulcer, gastrointestinal tumors and other pathological factors. 1. Physiological factors: eating too much too fast, overeating, mental stress, work pressure, staying up late, etc., the night movement is relatively small, will lead to functional indigestion, gastrointestinal peristalsis function is poor, the accumulation of food for a longer period of time, which produces more gas can not be discharged, resulting in the night bloating. 2. Pathological factors. (1) chronic gastritis: the mucosa of the stomach is stimulated by inflammation, so that excessive secretion of gastric acid, less activity at night, resulting in slower gastrointestinal peristalsis, resulting in gastrointestinal accumulation of gas, you will feel bloated at night. (2) duodenal ulcer: usually manifested as abdominal pain and discomfort, mainly in the form of abdominal pain or pain at night, or sometimes only manifested as distension and discomfort without pain, especially at night, distension and discomfort. (3) Gastrointestinal tumor: when there is space occupation in the gastrointestinal tract, it makes the secretion of gastric juice abnormal, which may lead to the symptom of bloating at night and nothing during the day. There may be other pathological reasons for nighttime flatulence, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.