Before we begin our discussion on the symptoms of colon cancer, it is important to realize that it is our goal to detect colon cancer before symptoms develop. When we begin to have symptoms of colon cancer. This is why it is extremely important that you have a colonoscopy to detect cancer before it develops. With that being said, it is important to know the most common symptoms of colon as a means to uncover this diagnosis in those who have not had a colonoscopy. Colon cancer symptoms include changes in the way someone passes their stool, abdominal pain, anemia or weight loss. At other times, one may have no symptoms at all. Let’s find out more about the symptoms of colon cancer.