Gastroenteroscopy is fine, intestinal gas may be caused by eating too much gas-producing food, intestinal dysfunction or functional dyspepsia. 1. Eating too much gas-producing food: gas can be produced when food enters the gastrointestinal tract for digestion, such as eating too much gas-producing food can cause gastrointestinal gas, abdominal distension and discomfort and other symptoms. 2. Intestinal dysfunction: a group of gastrointestinal dysfunction of gastrointestinal motility and secretion is a general term for gastrointestinal syndromes, which is caused by autonomic dysfunction due to the disorders of the higher nervous system and can be caused by mental tension, anxiety, stress, etc., without histologic organic lesions, i.e., gastroenteroscopy is not a problem. Can lead to intestinal gas more bloating, constipation and other symptoms. 3. Functional dyspepsia: it is a kind of clinical syndrome that appears a series of symptoms such as abdominal pain, gastrointestinal gas and bloating, belching, loss of appetite and so on, mostly related to ageing, insufficient gastric dynamics, mental tension and so on, after ruling out organic lesions. Patients can understand the specific cause of the disease through further examination and diagnosis, and according to the cause of the corresponding conditioning and treatment.