Diarrhea the day after drinking is caused by damage to the intestinal mucosa, which causes an attack of gastroenteritis. Most alcohol contains a certain amount of alcohol, and some components of alcohol are irritating and cause irritation to the mucous membrane of the intestines and stomach after intake. The irritation of the gastrointestinal mucosa not only induces inflammation, but also affects the function of the gastrointestinal system by causing excessive peristalsis. The process of alcohol retention in the digestive system can also lead to the killing of some beneficial bacteria, causing an imbalance in the intestinal flora. Especially after a night of stimulation, many people develop diarrhea the next day. When diarrhea occurs the day after drinking alcohol, it should be improved by taking medication that promotes mucosal recovery. And you should also avoid the intake of stimulating food during this time, preferably eating porridge to reduce the burden on the gastrointestinal system and allow it to recover as soon as possible.