Fresh blood on the last surface of the stool may be hemorrhoids, rectal polyps, anal fissure and so on. 1. Hemorrhoids: fresh blood on the last surface of the stool is more common in clinical bleeding hemorrhoids, especially internal hemorrhoids. By the stool extrusion blood vessel rupture bleeding, or hemorrhoid core prolapse, bleeding after stool, fresh blood is not mixed with stool. 2. Rectal polyps: larger rectal polyps are rubbed and squeezed by fecal matter, which may lead to bleeding, causing fresh blood on the surface of the feces after a bowel movement. 3. Anal fissure: when there is anal fissure, the stool squeezes the anal opening, which may cause bleeding in the fissure area, manifested as fresh blood on the surface of fecal matter or on the stool paper. In addition, it can also be seen in malignant tumors such as colon cancer, rectal cancer and other diseases, the presence of fresh blood after stool, need to consult the doctor in time to avoid delaying the condition.