If the milk expired for a short period of time without deterioration, inadvertent consumption usually does not have serious adverse effects on the body, but because the nutrients in the expired milk will gradually decompose and consume, after drinking it usually does not play a full complementary role in nutrition. If the milk has been expired for a long time, it may deteriorate and produce more bacteria, which can lead to the entry of pathogenic microorganisms into the body, causing abdominal pain, diarrhea, nausea, vomiting and other gastrointestinal symptoms, and in severe cases, even food poisoning, leading to acute enteritis, acute gastritis, gastrointestinal disorders and other diseases. If you drink spoiled milk for a short period of time and do not experience any discomfort, you can choose to drink more water or induce vomiting to help expel the expired milk in time. If you have consumed spoiled milk for a longer period of time or have obvious symptoms of discomfort, you are advised to go to the hospital for timely treatment by gastric lavage and medication to protect the gastrointestinal mucosa. In addition, it is recommended to observe the shelf life of food when drinking milk or eating other foods on a daily basis to avoid consuming expired foods that may cause discomfort.