It is more common in clinical practice to have blood in the anus, and the common causes include the following: 1. Internal, external and mixed hemorrhoids in the anorectum can be serious enough to appear with blood in the anus, especially when defecating, and it is most common to have fresh blood dripping after defecation. 2. Patients with anal fissures, due to the squeezing of the anus during defecation, can also cause bleeding in the anal fissure, which is also more common in clinical practice. It is also common for anal fissures to appear as bloody stools with pain or abnormal bowel changes. 3, some eczema tumors of the rectum and anus or polyps around the anus can also cause bleeding, it is best to go to a regular hospital for a detailed examination to find the exact cause through anoscopy, and according to the cause for systematic and standardized treatment.