A bulging stomach after eating a little food, i.e. bloating, may be caused by chronic gastritis, indigestion, imbalance of intestinal flora, food factors and other diseases. 1. Chronic gastritis: it will cause impaired stomach function, which will cause a feeling of bloating once you eat. 2. Indigestion: it will cause food to be stored in the stomach for too long and not be able to be emptied in time, which will then lead to the feeling of bloating in the stomach. 3. Intestinal flora imbalance: intestinal flora imbalance, the digestion and absorption of nutritious food is adversely affected, but also lead to the reaction of bad bacteria and undigested food residues, resulting in a large amount of gas leading to intestinal flatulence, resulting in bloating in the stomach. 4. Food factors: Consuming large amounts of gas-producing foods, such as carbonated beverages, colas, pumpkin, sweet potatoes, onions and soy products, can cause symptoms of flatulence. 5. Other diseases: for example, chronic cholecystitis, chronic pancreatitis can also cause indigestion, there will be a long-term bloating feeling; pyloric obstruction and intestinal obstruction can also cause significant abdominal bloating. Therefore, it is recommended that patients who still have abdominal distension after eliminating food factors should go to regular hospitals to receive examinations and be treated under the guidance of specialists according to the relevant examination results.