Diarrhea after drinking beer may be caused by non-infectious enteritis due to alcohol stimulation and cold stimulation, or it may be that the patient himself has irritable bowel syndrome, and drinking beer induces its attack. 1. Non-infectious enteritis: commonly seen when drinking a lot of cold beer, the alcohol in the beer stimulates the gastrointestinal mucosa, resulting in acute non-infectious enteritis, or inducing an acute attack of chronic enteritis, resulting in diarrhea. 2. Irritable bowel syndrome: a common dysfunctional syndrome, which can be manifested as recurrent diarrhea, constipation, constipation and diarrhea alternately, etc. Drinking beer can induce or aggravate the symptoms, and diarrhea phenomenon. If the diarrhea phenomenon is not serious, you can eat a light diet, try to eat warm, thin and soft, easy to digest food, such as rice porridge, noodle soup, noodle soup, etc., and drink more water. If the symptoms of diarrhea are serious, you need to consult a doctor, follow the doctor’s instructions oral rehydration salts, montelukast and other medications to prevent dehydration, electrolyte disorders and other conditions. People who are prone to diarrhea after drinking beer should try to avoid drinking beer and develop good eating habits.