Drinking milk when you have diarrhea tends to make it worse. Diarrhea may be related to eating too much frozen or spicy food, or gastrointestinal infections. As the fat content in milk is relatively high, it is difficult for the gastrointestinal tract to digest and absorb it during diarrhea, so drinking milk during diarrhea is not recommended. If a large amount of fat is ingested, it may irritate the mucous membrane of the gastrointestinal tract, speeding up gastrointestinal peristalsis and leading to aggravation of diarrhea. In addition, milk is also rich in lactose, lactose in the human body decomposition and metabolism generally need to use lactase, but some patients due to the lack of lactase, drinking milk in addition to aggravate diarrhea, but also may lead to intestinal tinnitus, abdominal pain and other uncomfortable symptoms. If the patient’s diarrhea symptoms are serious, or continue to see no improvement, it is recommended to go to the regular hospital in a timely manner, after clarifying the cause of the disease, targeted treatment under the guidance of the doctor, in order to reduce the adverse effects of the disease.