What are the symptoms of colorectal cancer?

Although colorectal cancer often has no symptoms, warning signs that may indicate colon cancer include blood in your stools, narrower than normal stools, unexplained abdominal pain, unexplained change in bowel habits, unexplained anemia, and unexplained weight loss. These symptoms may be caused by other benign diseases such as hemorrhoids, inflammation in the colon or irritable bowel syndrome. However, if you have any of these symptoms, you should be evaluated by your doctor.