A sigmoidoscopy is a diagnostic test used to check the sigmoid colon, which is the lower part of your colon or large intestine. This section of your colon is close to your rectum and anus. A sigmoidoscopy can help diagnose the following symptoms: Diarrhea.

What can a sigmoidoscopy detect?

During a flexible sigmoidoscopy, a healthcare provider uses a scope to view the inside of the lower (sigmoid) colon and rectum. The procedure helps diagnose bowel problems, such as ulcerative colitis, an inflammatory bowel disease (IBD). It can also detect colon polyps that can become colon cancer.

Why would a doctor order a sigmoidoscopy?

Your doctor may recommend a sigmoidoscopy to explore possible causes for abdominal pain, rectal bleeding, changes in bowel habits, chronic diarrhea and other intestinal problems. The procedure allows your doctor to check for inflammation, ulcers, abnormal tissue, polyps or cancer.