Drinking milk stomach grumbling also exhaust gas for the following reasons: First, the most common factor is lactose intolerance, lactase deficiency in the serving of milk and dairy products, milk lactose can not be fully absorbed and digested, so it will be retained in the intestinal lumen. Secondly, if the osmotic pressure of the contents of the intestinal lumen is too high, there is excessive accumulation of gas in the intestinal lumen, or patients with existing intestinal obstruction, chronic enteritis and colitis in the intestinal tract, the intestinal emptying speed is accelerated after drinking milk. At this time, the lactose in milk will be quickly discharged into the large intestine, will also produce gurgling also exhaust. Third, milk is susceptible to bacterial infection and fermentation and gas production, in the gastrointestinal tract there will be a large number of Escherichia coli, and the role of milk will be bloating, intestinal sound, exhaust and other conditions, so there will be gurgling and exhaust.