Diarrhea from drinking milk is divided into two cases, one is caused by physiological origin, such as lactose intolerance, given to replace low-lactose milk. The other cause is due to milk allergy or indigestion, it is recommended to seek medical attention and treatment according to the cause. A physiological cause: lactose intolerance: milk contains a large amount of lactose, lactose intolerant patients due to the lack of enzymes to digest lactose or the enzyme activity is reduced, drinking milk will cause diarrhea, bloating, abdominal pain and other symptoms. The main treatment is to adjust the dietary structure, to drink low-lactose milk, diarrhea can be serious oral probiotics such as lactobacillus, bifidobacterium to regulate intestinal flora, to relieve diarrhea symptoms. Second, the pathological causes: 1, milk allergy: milk allergy is more common in infants and young children, mainly allergic reactions to the proteins in milk. If the allergic reaction is not serious, desensitization treatment can be carried out under the guidance of a doctor. In serious cases, it is recommended to take formula milk and avoid eating milk and its products again on a daily basis; 2. For such patients it is recommended to improve dietary habits, do not greedy cold, greedy more, diet should pay attention to the principle of the right amount, the right time. At the same time, you can rest a little after eating, and then moderate exercise to help digestion and absorption of the gastrointestinal tract, diarrhea can be used to stop diarrhea in severe cases such as montelukast. If the baby is drinking milk for the first time, parents should first give a small amount, if the baby does not have symptoms of discomfort before continuing to supply, if vomiting, diarrhea symptoms, should immediately stop eating, it is recommended to seek medical advice to clarify the cause.