Why do you feel sick drinking water after alcohol to prevent a hangover?

Drinking water after alcohol can sometimes lead to feelings of nausea due to rapid rehydration, which may irritate the stomach, especially if it's empty or already upset from alcohol. Additionally, alcohol can disrupt the balance of electrolytes and cause inflammation in the stomach lining, making it sensitive to anything ingested afterward. The body's reaction to the combination of dehydration and the residual effects of alcohol can also contribute to this discomfort.