You are wise to have a colonoscopy done. It saved my life. At age 53, the doctors found a malignant tumor, removed it and a foot of my colon, found signet cell, mucinous, adenocarcenoma, Stage 3C appediceal cancer and 4 malignant lymph nodes. Had 6 months of 9 sessions of 48 hour chemo. Was given a 7% survival rate for 5 years. With surgeries, chemo and 1 year, 4 months later, my survival rate is now 30% for 5 years. No signs of cancer per post chemo colonoscopy, blood tests, bone marrow tests and CT scan. If it was detected a month later, it might have been too late... Life is back to normal.