Drinking milk bloating, may be gastric disease or lactose intolerance and other factors induced. 1. Gastric disease: such as gastritis patients and gastric ulcer patients, if a large number of drinking milk, will lead to patients due to the milk contains a large number of casein is difficult to be digested by the body, and then caused by abdominal distension. In addition, it will also lead to the stomach lining by the adverse stimulation caused by gastric peristalsis is relatively slow, induced by the stomach bloating symptoms. 2. Lactose intolerance: some patients may be due to the lack of lactase enzyme and difficult to break down lactose in the body, resulting in a large amount of lactose accumulation in the stomach, resulting in gastrointestinal stimulation, causing gastrointestinal and diarrhea and other symptoms. It is recommended that patients need to go to regular hospitals to receive further examination, according to the relevant test results, under the guidance of specialists.