Welcome! Discuss your experiences, share your stories and get friendly help and advice. This forum provides members experience based informative help for such health issues as anal fissures, hemorrhoids, fistulas, IBS, Crohn's
A flexible sigmoidoscopy only sees 1/3 of the entire colon, I'm surprised your doctor didn't do the colonoscopy so he could get a clear picture of the entire colon. If you're bleeding and your doctor says he can't see anything please get a second opinion.