The causes of dizziness, nausea, and vomiting in patients after drinking alcohol are as follows: 1. Alcohol has a certain stimulating effect on the central nervous system and cerebral blood vessels after drinking alcohol, which can lead to the symptoms of dizziness and nausea.2. Drinking alcohol can lead to the dilation of blood vessels in the head of the patient, which can also lead to dizziness.3. Alcohol enters the gastrointestinal tract and has a certain stimulating effect on the mucous membranes of the gastrointestinal tract, so it also leads to the patients having the symptoms of symptoms of nausea, stomach discomfort and vomiting. If patients often have symptoms of dizziness, nausea and vomiting after drinking alcohol, it is recommended that they quit drinking or reduce the amount of alcohol they drink. This is because long-term and heavy drinking is not good for health, and can easily lead to diseases such as alcoholic encephalopathy, alcoholic peripheral nerve injury, and alcoholic cirrhosis of the liver.