Dry stools tend to cause bleeding with a bright red color, the possible causes are anal fissures and possibly hemorrhoids. Anal fissure is a relatively common disease, generally dry stool is easy to make the anal canal skin fissure, force defecation leads to anal canal fissure, sometimes there will be blood in the stool, the amount of bleeding is usually not a lot, is dripping blood or wipe the stool on the hand paper stained with blood, if the local wound infection later there will be pus and blood and mucus, so dry stool, bleeding is generally constipation and anal fissure as a result of each other, the two affect each other, anal fissure Most patients have a history of constipation. If there is dry stool leading to bleeding, it may also be hemorrhoids, hemorrhoids are varicose veins, long-term stool stimulation, constipation, easily make hemorrhoid nucleus stagnation, swelling, hemorrhoid vein stasis and thus the formation of hemorrhoids, rectal diagnosis, placement of anoscopy can be clearly diagnosed.