The colonoscopy only visualizes the colon. It may be that you have more serious inflammation higher up in the small bowel, which could easily account for your symptoms. My initial colonoscopy showed multiple ulcerations, inflammation and granulomas throughout the upper two-thirds of my colon. Two years later, only a couple in the colon, but continuing visible inflammation in the last couple of inches of the terminal ileum and likely further up into the small bowel. Remember that the colon is only 12-15 feet of a GI tract that runs 40 feet or more from mouth to anus, and that Crohns can be anywhere along the way.