The performance of common anal diseases 1, hemorrhoids: hemorrhoids can cause fresh blood in the stool, the amount is not much, bleeding or dripping blood or spraying out during the stool. The bleeding will stop immediately. 2, anal fissure: anal fissure can also be blood, but accompanied by regular pain during defecation. 3, colitis: colitis, proctitis also blood, blood volume is less, more mixed with the stool and mucus thin stool and other symptoms. 4, rectal polyps: rectal polyps also stool blood, blood volume is generally larger, accompanied by the mass prolapse. 5, rectal cancer or colon cancer: rectal cancer or colon cancer also blood in the stool, but the color is mostly dark red, odor, with flesh-like material out of the stool and other symptoms.