10 Signs of Colon Cancer

2. Blood in Stool

As cancer grows, it invades the wall of the colon and damages blood vessels. The blood from these damaged vessels may go into the colon. In that case, you will see it when you use the toilet. The blood might appear like drops of blood in the water, like a smear of blood on the toilet paper when you wipe, or the stools themselves may have blood on them. Visible blood is more common with cancers that involve the distant colon and rectum. Keep in mind that blood might also come from hemorrhoids, so seeing blood does not mean you have cancer.