Consider the normal physiological situation and pathological situation such as abdominal tumor when the stomach bulges greatly at the first meal. 1. Physiological conditions: when the patient eats too much food or drinks too much beer or carbonated beverages, there will be a situation that the stomach bulges greatly when eating, which is a normal physiological phenomenon. In addition, when pregnant, the patient may also have a bulging stomach when eating. 2. Pathological conditions: when the patient develops abdominal tumors, there will be a large bulging of the stomach at the beginning of the meal, and when the patient develops irritable bowel syndrome, this situation may also occur. In addition, there may be other reasons why the stomach bulges when you eat, so it is recommended that you go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.