The symptoms of vomiting after drinking alcohol are related to the following reasons: 1. Alcohol can have an irritating effect on the mucous membrane cells in the digestive system tissues, and the stomach, intestines and other digestive organ tissues are induced to contract spasms under such stimulation. The food and water in the digestive tract will cause reflex vomiting when the internal air pressure is increased. 2. Alcohol also has an effect on the central nervous system, such as the sympathetic center, the vomiting center, and the humoral regulation center. The vomiting central system will be hyperactive under the effect of alcohol, thus causing nausea and vomiting symptoms in drinkers. In conclusion, the adverse symptoms of nausea, vomiting, dizziness and weakness caused by alcohol consumption may vary individually due to different physical conditions. If patients experience violent vomiting and unconsciousness after drinking alcohol, they need to be sent to the hospital for examination in time to avoid serious consequences.