The following conditions are common: 1. functional gastrointestinal disease, gastroscopy does not see abnormalities, but after eating, bloating, abdominal pain, acid reflux and other symptoms of indigestion. 2. dysbiosis of intestinal flora, various causes of dysbiosis of intestinal flora, and the increase of gas-producing bacteria, eating less but producing more gas, will also appear symptoms of bloating. 3. obstructive lesions, various causes of Stomach or intestinal discomfort or even obstruction can cause symptoms such as abdominal distension, and in severe cases, nausea, vomiting, inability to pass stool and severe pain in the abdomen.