Drinking milk stomach discomfort, consider the following reasons: 1, stimulate the gastrointestinal mucosa: eaten milk is too cold, such as from the refrigerator, just taken out of the pure milk or yogurt, after drinking will stimulate the gastrointestinal mucosa, causing stomach discomfort. 2, digestive enzyme deficiency: a certain lack of digestive enzymes in the body, resulting in lactose intolerance, after drinking milk will have stomach discomfort, diarrhea, nausea and other symptoms. 3, gastric disease: chronic gastric diseases such as Gastric ulcer, acute erosive gastritis patients, after eating milk, the tyrosine in milk is not easy to digest, it will clump in the stomach, leading to increased secretion of gastric acid, stomach discomfort, nausea, and even stomach pain and other symptoms, so patients with underlying chronic gastric disease should try to reduce the intake of milk. If there are often uncomfortable symptoms such as stomach pain, nausea and urge to vomit, gastroscopy is recommended to find out if there are any organic lesions.