There are many reasons for gas returning to the stomach after eating, the common ones being improper diet and digestive system diseases. 1. Improper diet: Improper diet includes improper food consumption and improper dietary lifestyle; such as consuming a large amount of gas-producing food: tofu, soy milk, etc., can also appear after eating a meal in the stomach gas to return upward. Dietary lifestyles such as eating too fast, overeating, eating while exercising, etc. can also have such symptoms. For this kind of situation, we should pay attention to the regulation of eating habits, chewing and swallowing slowly, and avoid eating a lot of cold food. 2. Digestive system diseases: such as gastritis, peptic ulcer, gastric cardia flaccid disease and other diseases, can also lead to the phenomenon of gas returning to the stomach after eating. Gastrointestinal dysfunction and indigestion can also lead to gas returning to the stomach after eating. Gastrointestinal colds can also cause similar symptoms. When there is gas returning to the stomach after eating, excluding improper diet and external factors, but still persists without relief, it is recommended to consult the gastroenterology department in a timely manner, to clarify the cause of the disease, to treat the cause of the disease, to use medication under the guidance of the doctor, and to actively treat the disease, so as to avoid delaying the condition.