A bigger stomach after eating may be related to factors such as air entering the stomach, overeating and constipation. 1. Air enters the stomach: If you always talk while eating, it can cause a lot of air to enter the stomach. A lot of air and food make the stomach dilate, which can cause the stomach to become bigger. 2. Eating too much: If you eat a lot of food in one meal, a lot of food enters the digestive tract together, which not only makes the stomach bigger, but also expands the intestines, thus causing the stomach to become bigger. 3. constipation: constipated people originally digestive tract has accumulated a lot of content, after eating a meal, the content of the digestive tract increased, so that the digestive tract is large, the stomach will be correspondingly large. If the stomach will become bigger after eating, and accompanied by abdominal pain, bloating and other symptoms, we should promptly go to the hospital to find out the cause, do not delay.