Bleeding after drinking is one of the conditions of blood in the stool. While blood in stool is a common symptom of anorectal diseases, it often indicates the occurrence of many kinds of anorectal diseases, such as hemorrhoids, anal fissures, enteritis and even intestinal cancer, etc. If blood in stool occurs after drinking, then hemorrhoids and enteritis are the most likely. The differential diagnosis of blood in the stool after drinking is made based on clinical manifestations combined with physical and chemical examinations, just like other diseases. The main differentiation is the primary cause of blood in the stool, which can be determined based on the characteristics of blood in the stool and accompanying symptoms, laboratory tests, imaging examinations, etc. In addition, animal blood, drugs, etc. may lead to changes in stool color, which should be asked and identified with attention. The specific identification methods are as follows: 1. gender and age: bleeding hemorrhoids are mostly seen in adults, bleeding polyps are mostly seen in children and young people, bleeding anal fissures are mostly seen in young women, bleeding malignant tumors are mostly seen in middle-aged and old people. 2, morbidity characteristics: dysentery often has a history of unclean diet, schistosomiasis, epidemic hemorrhagic fever and leptospirosis are from infected areas or contact with epidemic water history, radiation colitis has a history of radiation therapy, upper gastrointestinal bleeding caused by blood in the stool patients often have a history of gastric disease or biliary disease. 3, the relationship between blood color and concomitant symptoms: the color of blood in the stool and concomitant symptoms have an extremely important value for the differential diagnosis of blood in the stool, and must be carefully asked.