The symptoms of rectal cancer with blood in stool are not necessarily advanced. Generally, the common symptoms of rectal cancer include constipation, diarrhea, alternating constipation and diarrhea, anal swelling, vague pain in abdomen, blood in stool, intestinal obstruction, or abdominal mass, anemia, emaciation, fever, general weakness, etc. These are the more common symptoms of rectal cancer. The mechanism of rectal cancer blood in stool occurs because the tumor of rectum breaks down and causes bleeding, so the blood in stool of rectal cancer is not necessarily related to whether the tumor is early or late. What are the symptoms of late stage rectal cancer? Generally, if rectal cancer extensively infiltrates into the pelvic cavity, lumbosacral pain and sciatica will appear, and invasion of the bladder mucosa may lead to hematuria or even uremia. Therefore, these are relatively advanced manifestations of rectal cancer, while blood in stool of rectal cancer is not necessarily advanced.