In general, milk protein allergy diarrhea can be cured in about 3 to 7 days after intake of milk-containing food, the specific time should be based on the severity of the disease, the amount of milk intake, the patient’s physical fitness and so on to judge. If the diarrhea and other symptoms are not very serious, the patient’s physical condition is better, the amount of milk intake is less, the general healing time will be faster, and vice versa may prolong the healing time. The main reason for milk protein allergy is that the patient’s body lacks the enzyme to digest milk protein, resulting in the inability to absorb the large molecules of protein in milk after drinking milk or consuming milk products. After drinking milk, milk protein stimulates the body’s immune system and produces corresponding antibodies, which combine with milk protein and cause symptoms such as diarrhea, abdominal pain, nausea and other symptoms, resulting in an allergic phenomenon. Milk protein allergy patients should try to avoid drinking milk protein-containing beverages to minimize the chance of allergy. If necessary, they should consult a doctor to identify the cause of the allergy, and under the guidance of the doctor, carry out targeted treatment.