There are many reasons for blood in the morning stool: 1. Dry stool can easily damage the skin of the anal canal and lead to anal fissures, and there will be some fresh blood on the surface of the stool. 2. The cause of blood in the stool may be hemorrhoids, with dry stool, constipation, and increased abdominal pressure, which can lead to increased pressure and congestion of the hemorrhoid nucleus, swelling of the hemorrhoid nucleus, and rupture of the hemorrhoid vein, which leads to blood in the stool, usually in the form of dripping blood or jets. 3. If there were previously rectal polyps and rectal adenoma, it is possible to damage the mucosal surface of the polyps under the stimulation of stool, which leads to the rupture of blood vessels and causes blood in the stool. Therefore, there are many reasons for blood in the stool in the morning, which should be combined with medical history, physical examination, and rectal rectal examination if necessary, as well as anoscopy to clarify the site and cause of bleeding.