I could answer this question, but I don't want to scare you. The problem is, the common signs of cancer (colon) are very common symptoms that many people experience. These signs are over 90% of the time, not cancer. If someone has blood in their stool, they probably don't have cancer. If someone is constipated, they probably don't have cancer. So if you read on the internet and see that you have the signs of cancer, testing should be done, but you probably don't have cancer.