Post-drinking diarrhea may be caused by cold, gastrointestinal dysfunction, enteritis and other reasons. 1. Cold: when drinking a lot of cold beer or taking cold food in the process of drinking and other triggers, may stimulate the gastrointestinal mucosa leading to increased gastrointestinal peristalsis and intestinal spasms symptoms of post-drinking diarrhea. 2. Gastrointestinal dysfunction: Alcohol may lead to intestinal brain nerve excitation, increased gastrointestinal peristalsis and symptoms of post-drinking diarrhea. 3. Enteritis: Alcohol may inhibit the normal intestinal flora, reduce intestinal immunity and lead to the growth of pathogenic bacteria, which induces enteritis and symptoms of diarrhea after drinking. If the symptoms of diarrhea after drinking, you need to go to the hospital for further blood tests, stool routine and other items to find the cause.