The next day after drinking alcohol, frequent nausea and vomiting may be caused by the following reasons: alcohol stimulates the nervous system, alcohol stimulates the gastric mucosa, alcohol causes pancreatitis, and hypoglycemic reaction after drinking alcohol. 1. Alcohol stimulates the nervous system: after drinking alcohol, alcohol will play a stimulating effect on the central nervous system of the human body. On the second day of drinking, the central stimulating effect of alcohol on the brain is not completely lifted, and the patient will feel dizziness, headache, and reflexively cause frequent nausea and vomiting symptoms. 2. Alcohol stimulates the gastric mucosa: After drinking alcohol, it enters the stomach and stimulates the gastric mucosa, which in severe cases can lead to damage to the gastric mucosa, thus affecting the function of the gastrointestinal tract and causing the patient to suffer from the above symptoms. 3. Alcohol-induced pancreatitis: after drinking alcohol, alcohol will stimulate the pancreas to secrete a large amount of digestive enzymes, which will cause the pancreas to undergo its own digestion, resulting in pancreatitis, which will lead to the symptoms mentioned above, and may be accompanied by the symptom of pain in the left upper abdomen. 4. Hypoglycemic reaction after drinking alcohol: after drinking alcohol, a large amount of alcohol enters the blood tissues, stimulating insulin secretion, coupled with the patient’s stomach discomfort after drinking alcohol, usually unable to eat, so that hypoglycemic reaction occurs, the patient will have frequent nausea and want to vomit the symptom, and at the same time may also be accompanied by symptoms of panic, dizziness. Patients who experience frequent nausea and vomiting after drinking alcohol must seek medical attention in a timely manner so as not to delay their condition.