Hi Pauline... Welcome to Healing Well
A sigmoidoscopy is a flexible scope as well however they do not look past the sigmoid colon (hence the name). A full colonoscopy will scope your entire colon. In terms of what gathers more information, it would be a full colonoscopy. Sigmoidoscopys are usually less cost because if they have the equipment, they can do this in a doctor's office versus a hospital / surgery clinic setting. They will not give you anything to "put you out" for a sigmoidoscopy so many prefer the colonscopy over it.
Have you tried anything (OTC or rx) for the gas? Researchers now say that even though rare, IBS can present itself without bowel changes although that is different than the classic Rome criteria of diagnosing IBS. They now say that pain can be a main symptom.
Have you seen a gynecologist as well to rule out any female issues?
Co-Moderator ~ IBS Forum
Co-Moderator ~ Lupus Forum
Dx: IBS 1989, Diverticulosis 2004, Idiopathic Acute Colitis 2006, UCTD 2007
Meds: Plaquenil 400mg, Chlorzoxazone 500mg, Lyrica 50mg, Protonix 40mg, Naproxen 1000mg, Klonopin PRN, Miralax 17g, Supplements