Nausea and vomiting after drinking milk may be caused by lactose intolerance, gastric ulcers and other stomach disorders. 1. Lactose intolerance: some people due to the lack of lactase enzyme in the body, and milk contains a large amount of lactose, so after drinking milk lactose can not be broken down by lactase enzyme, thus causing nausea, vomiting, regurgitation and other symptoms, and sometimes can be accompanied by diarrhea symptoms occur, this group of people to avoid drinking dairy products. 2. Gastric lesions: for example, gastritis, gastric ulcer and other lesions of the crowd after drinking milk, due to indigestion phenomenon can also appear nausea and vomiting symptoms, this kind of people can take domperidone and other gastrointestinal dynamics of the drug or take omeprazole acid suppression drugs for treatment. Drugs need to be applied under the advice of a doctor.