Why did you drink beer and have diarrhea?

After drinking a lot of beer, because beer contains alcohol, alcohol stimulates gastrointestinal mucosa and causes intestinal peristalsis to accelerate and cause diarrhea. Or there are gastrointestinal diseases, such as chronic gastritis, ulcerative colitis, etc., alcohol stimulates inflammatory mucosa, causing gastrointestinal peristalsis to accelerate and cause diarrhea. People with gastrointestinal diseases should drink as little as possible to prevent spicy, irritating food, should be given a light, digestible diet.