Had a sigmoidoscopy once and that was enough. The prep is the same. They shove a tube up your rear about 1/3 the distance of a colonoscopy, but you're completely awake during the procedure and it feels like they go all the way up to your tonsils. Ended up having to have a hemorroidectomy shortly afterwards to repair the damage. Not doing that again.
I just read about a recent major study which questions the effectiveness of regular colonoscopy screenings. Not sure what to think.
A "landmark" study suggests the benefits of colonoscopies for cancer screening may be overestimated.
www.cnn.com