Frequent diarrhea after drinking beer may be a physiological phenomenon, but also may be a symptom of certain diseases, such as enteritis, irritable bowel syndrome, etc., and should be promptly consulted to identify the cause of the disease. 1. Physiological factors: due to drinking beer is too cold, when the chilled beer into the body after the gastrointestinal mucosa caused by the stress response, resulting in frequent diarrhea phenomenon. 2. Pathologic factors: (1) Because beer and other irritating drinks can lead to enteritis, resulting in frequent diarrhea, which may also be accompanied by fever, nausea, vomiting, abdominal pain, dilute stool or mucus, pus and blood stools, etc., and some patients may also have fever and other general discomfort. (2) Due to beer intolerance caused by irritable bowel syndrome, may be manifested as increased frequency of stools, mostly mucus thin stools, not frequent watery diarrhea; may also be accompanied by postprandial or predefecation abdominal pain. It may also be caused by other factors, such as hyperthyroidism, but this symptom alone is not enough to diagnose the disease. It is recommended that if physiological causes are ruled out, a doctor should be consulted to clarify the cause of the disease and provide targeted treatment.