Evening bloating may be related to flora imbalance, improper diet and gastritis. 1. Flora imbalance: it may be that the food eaten at dinner is unclean or spoiled, causing intestinal flora imbalance, weakening of digestive function and bloating. 2. Improper diet; when eating too much food for dinner or eating more gas-producing food, the food or a large amount of gas stagnates in the gastrointestinal tract, and bloating will also occur. 3. Gastritis: chronic gastritis can cause gastrointestinal insufficiency of power, food can not be emptied in time, bloating can also occur. There may be other reasons for evening bloating. It is recommended to seek medical advice, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and targeted treatment or treatment.