Drinking pure milk diarrhea is mainly considered to be related to improper drinking, lactose intolerance and other digestive disorders, and should be treated with general therapy, lactase, bifidobacteria, montelukast and other medications in a timely manner for intervention. 1. Improper drinking: Drinking expired milk or drinking it directly from the refrigerator can cause diarrhea. As long as the bad drinking habit is corrected in time, the symptoms can be improved effectively. 2. Lactose intolerance: patients are unable to completely break down and digest the lactose in milk, which leads to diarrhea and abdominal pain. This symptom can be treated with lactase and bifidobacteria under the guidance of a doctor. 3. Digestive system diseases: such as gastric ulcer and other diseases, after being stimulated by diet, can cause acute attacks, which in turn lead to diarrhea symptoms. For this situation, under the guidance of the doctor can be applied to omeprazole, bismuth pectin and montelukast and other drugs for treatment. The cause of the patient’s illness varies, and the corresponding treatment measures must be taken after examination and following the doctor’s advice.