Blood in the stool and pain in the anus are not necessarily manifestations of rectal cancer. Blood in stool can be divided into hemorrhoid, anal fissure, and rectal cancer, and the clinical manifestations of the three are as follows: 1. hemorrhoid, there is a layer of fresh blood outside the stool, or blood drips when defecating, and the local symptoms will be aggravated after constipation, drinking alcohol, eating irritating food, and pain can appear when infected; 2. anal fissure, the blood is bright red, and the bleeding amount is not much, usually not mixed with stool, and there can be severe pain; 3. rectal cancer The blood is mixed with feces, and there is a feeling of swelling in the anus in the early stage.