Lactose intolerance is mainly due to the lack of lactase in the body, which does not completely break down the lactose contained in breast milk and cow’s milk, thus causing a series of clinical symptoms, and clinically it is mainly non-infectious diarrhea. Lactose intolerance, also known as lactose deficiency, is mainly prevalent in newborns or infants, because the main diet of newborns or infants is based on breast milk or cow’s milk, so lactose intolerance is prevalent in these two groups. The main clinical symptom of lactose intolerance is diarrhea, some children have diarrhea up to dozens of times a day, and some children have intestinal gas, so it is recommended that patients with lactose intolerance immediately go to the hospital for symptomatic treatment under the guidance of a professional doctor.