Drinking milk diarrhea may be due to lactose intolerance, allergies, low milk temperature and other reasons. 1. Lactose intolerance: when the lactase enzyme secretion in the human body is insufficient, it may lead to lactose intolerance, and milk contains a large amount of lactose, after drinking milk, the lactose in the milk can not be digested properly, which may cause diarrhea, and may also be accompanied by abdominal pain, abdominal distension and other symptoms. 2. Allergy: milk contains a lot of protein, and some people are allergic to protein, so drinking milk may also appear diarrhea symptoms, but some patients may be accompanied by respiratory difficulties, skin rashes and other symptoms. 3. Low milk temperature: If you put the milk into the refrigerator, the temperature of the milk taken out of the refrigerator is relatively low, and if you drink it directly, it may stimulate the gastrointestinal tract and cause diarrhea. After drinking milk diarrhea symptoms, the symptoms are relatively mild can be observed, the symptoms are more serious or continue to appear, it is recommended to go to the hospital as soon as possible, clear cause of the cause under the guidance of the doctor for the cause of the treatment.