There are several reasons for stomach pain immediately after drinking milk: 1. Stimulation of gastric mucosa: Consider milk too cold, such as pure milk or yogurt just taken out of the refrigerator, after drinking it is easy to stimulate the gastric mucosa and stomach pain symptoms. 2. Lack of digestive enzymes in the body: such as lactose intolerance, after drinking milk will have stomach discomfort. 3. Chronic gastric diseases: such as gastric ulcer in patients, after eating milk, the tyrosine of milk is not easy to Digestion, will be clotted in the stomach, resulting in increased secretion of gastric acid, so that the symptoms of gastric ulcer aggravated, so patients with gastric ulcer should try to reduce the intake of milk. If you have frequent stomach pain, it is recommended to perform a gastroscopy to understand whether there are organic lesions, and to eat more warm, soft, light and easily digestible food in daily life, avoiding cold, greasy and spicy stimuli.