There are the following reasons for the constant stomach distension in the middle of the night: 1, gastrointestinal diseases, stomach diseases such as acute gastritis, acute gastric dilatation, gastric prolapse, gastric ulcer, chronic gastritis, etc., intestinal diseases such as acute hemorrhagic necrosis of the intestine, bacterial dysentery, intestinal tuberculosis, etc., which can lead to stomach distension in the middle of the night. 2, dietary factors, eating unclean food or food that is particularly difficult to digest can easily lead to stomach distension in the middle of the night, eating too fast, not Chew slowly and swallow quickly, chew twice and swallow, eaten food is not easily digested will bring a great burden to the stomach. There are also stressful life, depressed mood, may also lead to stomach bloating. 3, bad habits, food into the stomach takes about an hour to digest, if you lie in bed immediately after eating, the speed of the stomach to digest food will drop, it is likely to appear in the middle of the night stomach bloating, so after eating you can walk properly to help promote digestion.