Wow, this is an old post, written about a week before I had my surgery.
I do believe that constant inflammation causes permanent damage to any organ, colon or otherwise.
I suffered from ongoing inflammation of the rectum for twelve years. The day after my operation, my surgeon said to me that I had made the right decision because my rectum was badly diseased.
My paternal grandmother died from cancer of the rectum and I was recently told that her symptoms were the exact same as I had suffered. She passed in 1952 when I was only six years old. Back then, not many people spoke of these ailments. Ironically, she died at the same age as I am now.