The bright red blood after bowel movement is considered to be related to hemorrhoids, anal fissure, rectal polyps and other diseases. 1. Hemorrhoids: mainly due to the anal cushion downward, varicose hemorrhoidal veins, poor defecation habits, poor diet and so on, often showing bleeding during defecation, pain, anal itching and even prolapse of hemorrhoids, which may lead to the emergence of stool after the situation of bright red blood. 2. Anal fissure: mainly due to long-term constipation, diarrhea, anal canal stenosis, infection and other factors, often showing pain, blood in the stool, accompanied by constipation, itching, etc., which may lead to the emergence of stool after the situation of bright red blood. 3. Rectal polyps: mainly caused by inflammation, infection, heredity, diet, etc., often manifested as repeated bowel movements, blood in stool, etc., which may lead to the appearance of bright red blood after bowel movement. In addition, constipation, rectal tumor, trauma and other factors can also lead to the situation of bright red blood after stool. Therefore, if there is bright red blood after stool, it is recommended to consult a doctor as soon as possible to make a clear diagnosis and then provide targeted treatment.