The main causes of increased gas in the abdominal cavity are: i. Increased gas outside the intestinal tract. It is seen in gastrointestinal perforation, mostly gastric or duodenal perforation, and is easily triggered by a history of peptic ulcer, long-term oral administration of non-steroidal antipyretic analgesics, and eating harder food. Second, increased gas in the intestinal tract. Seen in the elderly, gastrointestinal peristalsis weakened, and inflammation of the abdominal organs, such as cholecystitis, pancreatitis, appendicitis, peritonitis, gastroenteritis, etc. Third, poor liver function, hypoproteinemia causing ascites, which affects gastrointestinal function, can also lead to increased gas accumulation in the intestine. Fourth, intestinal obstruction caused by various reasons, including mechanical, dynamic, and hemodynamic, affects gastrointestinal emptying and leads to increased gas in the intestine.