In this case, it depends on the cause of the hemorrhoids. In general, the most common cause of hemorrhoids is varicose veins around the rectal veins, which can be caused by obstructed venous return. Generally, there are no corresponding venous valves around the upper rectal veins, and the veins or small vein walls of hemorrhoids are very thin. In the case of hemorrhoidal venous varicose, if the stool is relatively dry, it is easy to cause the veins to rupture and bleed during defecation. This type of bleeding is generally painless, and the bleeding can stop on its own, usually being bright red blood. Due to high local pressure, some people may experience significant bleeding, or even show signs of shock. In this case, surgical treatment measures must be taken to achieve radical cure.