Alcohol stimulates the intestinal tract, so if people with poor gastrointestinal function are prone to blood in the stool after drinking alcohol, the following etiologies need to be considered: 1. If you are allergic to alcohol, it may lead to damage to the intestinal mucosa, resulting in the symptoms of blood in the stool. 2. People suffering from perianal diseases, such as hemorrhoids, anal fissures, anal fistulas, and perianal abscesses, etc., will stimulate the mucous membrane around the anus after drinking alcohol, resulting in blood in the stool. 3. For example, chronic colitis, proctitis, or ulcerative colitis, Crohn’s disease, or colorectal polyps and tumors, etc., are also susceptible to the stimulation of alcohol, which can lead to bleeding and thus blood in the stool. After drinking in moderation in normal people, it usually does not lead to blood in the stool. If this happens, it is best to go to the hospital to improve gastroscopy to rule out gastrointestinal lesions.