The patient’s left upper abdominal distension after meals may be caused by improper diet, indigestion, gastritis and other reasons. 1. Improper diet: patients eat too much food that is easy to produce gas, such as white radish, pumpkin, chestnut, sweet potato, yam, potato, soybean, cabbage and other foods, resulting in gastrointestinal flatulence and increased exhaust, the patient will appear left upper abdominal distension. 2. Dyspepsia: patients with gastric insufficiency after eating, delayed gastric emptying, leading to dyspepsia, patients may experience nausea, vomiting, abdominal fullness and bloating symptoms. 3. Gastritis: patients with gastritis slow down gastric emptying due to decreased gastric acid secretion, leading to accumulation of gas and food in the gastrointestinal tract, causing patients to experience abdominal distension and bloating discomfort. It is recommended that patients who experience left upper abdominal distension after meals go to the hospital in time.