There are two main reasons for nausea and vomiting when drinking alcohol: 1. The drinking itself, alcohol will easily lead to damage to the mucosa, causing congestion, edema, and even erosion of the gastric mucosa and esophageal mucosa, and in some cases, ulcers may appear, and this condition will lead to disorders of the gastrointestinal tract, causing nausea and vomiting. 2. Alcohol itself is a drink that damages the liver and will lead to damage to liver function The accumulation of alcohol within a short period of time will lead to an increase in acetaldehyde, which cannot be effectively broken down into acetic acid, and the repeated accumulation of acetaldehyde will easily lead to the production of toxins throughout the body, causing gastrointestinal symptoms and leading to nausea and vomiting. Therefore, drinking alcohol with nausea and vomiting is a relatively common clinical manifestation, it is best to drink more water, pay more attention to rest, intravenous infusion of fluids, and give supplemental sugar and water symptomatic treatment.