In patients with anal fissures, they do not bleed every time they have a bowel movement. For early anal fissures, or those with less severe symptoms, there is only a stinging pain or fissure when defecating, but no bleeding. For patients with deeper fissures and more severe symptoms, in addition to painful bowel movements, there is also bleeding. However, the degree of bleeding varies, from rubbing blood to dripping blood, and in severe cases, jet-like bleeding may occur. Therefore, whether or not anal fissure bleeding manifests itself depends mainly on the severity of the symptoms of anal fissure. Also, bleeding in patients with anal fissures has to be distinguished from bleeding internal hemorrhoids. Anal fissure bleeding is more or less accompanied by anal pain. In patients with internal hemorrhoid bleeding, the manifestation is painless blood in the stool, and patients should pay attention to the difference in clinical practice.