What are early symptoms of colorectal cancer?

May be none: Many early cancers do not have any symptoms and that is why it is important to have screening tests done, e.g., colonoscopy at age 50 for prevention of colo-rectal cancer. Symptoms may be change in bowel habits, bleeding per rectum, anemia, bowel obstruction and the first symptoms may be from metastases to other organs such as liver.

Few if any: Colon cancer is generally a very silent disease until it is advanced often early stage i and ii cancers will have no symptoms which is why routine screening colonoscopy is so important. Abdominal pain rectal bleeding unexplained weight loss fatigue may all be associated with a more advanced cancer. Total obstruction or perforation may be found in bet advanced cancers.