Diarrhea is also known clinically as diarrhea. In the case of diarrhea from drinking milk, the first thing to consider is whether it is related to faulty milk quality, expired, too cold, etc. It may also be caused by some people being allergic to certain components of milk, or by a lactose intolerance condition. The initial judgment can be made according to the following different reasons, so that the cause can be addressed: 1. Milk problems: milk quality is not up to par, expired, or drinking too cold, too hot, etc. may cause the symptoms of diarrhea after drinking milk. Especially for the elderly, children and other gastrointestinal function is poor, as well as the existence of gastritis, peptic ulcers and other digestive system diseases of the population. Therefore, when choosing milk, you should pay attention to check the shelf life date, avoid choosing products that are not available, and ensure that the milk is consumed at a relatively appropriate temperature. 2. Milk component allergies: milk contains casein, lactose, whey protein and other components, and if some people are allergic to some of these components, diarrhea may occur. Allergen testing can be performed to initially screen the factors that cause allergies, or minimize milk consumption to avoid diarrhea symptoms; 3, lactose intolerance: some people lack an element in the body called lactase, which is mainly used to break down and metabolize lactose in food in the body. When people who lack lactase ingest milk, the intestines cannot digest it because lactose cannot be broken down and metabolized in the body, which may lead to symptoms such as intestinal tinnitus, abdominal pain and diarrhea. This can be relieved by drinking milk in small amounts several times, or by choosing alternative drinks such as low lactose milk and yogurt; 4. Other factors: milk is a food that is easy to produce gas, and after drinking milk may produce some gas in the intestines, leading to gastrointestinal indigestion. Drugs such as gastrointestinal tablets and domperidone tablets can be used to help the body promote gastrointestinal digestion. In addition, if the patient has symptoms of intestinal flora imbalance, drinking milk may also cause diarrhea symptoms to occur. Drugs that regulate intestinal flora, such as Lactobacillus tablets and Bifidobacterium tetrasporium tablets, can be used to help improve the intestinal condition. In addition, if the patient has other diseases of their own, such as gastritis, enteritis, diabetes, hyperthyroidism, etc., they may also be prone to diarrhea, which may just happen to flare up after drinking milk. Therefore, if the patient has a primary disease, he or she needs to be actively treated for the primary disease in order to avoid diarrhea.