The causes of stomach bulging mainly include physiological factors and pathological factors such as gastric polyps, pyloric obstruction and gastric cancer. 1. Physiological factors: If you have the habit of overeating or eating too much food, it will lead to the enlargement of the stomach body and bulging of the stomach. This condition usually does not need treatment, and improving eating habits can be enough. 2. Gastric polyps: If the surface of the gastric mucosa is bulging, it may be caused by gastric polyps, if the polyps are relatively small, you can first observe and regularly review. If the gastric polyp is large or has obvious clinical symptoms, timely surgical resection is recommended. 3. Pyloric obstruction: There is a part of the stomach body called pylorus, if the pylorus is obstructed, it will lead to food and gastric juice cannot pass through smoothly, and when there is too much food in the stomach, the stomach body will bulge. 4. Gastric cancer: gastric cancer can also lead to stomach bulging, and it is recommended to have surgery as soon as possible and combine with radiotherapy if necessary. Besides the above mentioned points, there may be other reasons causing stomach bulging, so it is recommended to go to the hospital for consultation in time.