A sigmoidoscopy (also called flexible sigmoidoscopy) is a diagnostic procedure that allows doctors to examine the lower part of the large intestine, specifically the rectum and the sigmoid colon (the last section of the colon). It is performed using a thin, flexible tube called a sigmoidoscope, which has a light and camera at its tip. This device transmits real-time images to a monitor, helping doctors detect abnormalities in the lower bowel.
Sigmoidoscopy is generally safe, but minor risks include:
Most people experience only mild discomfort, cramping, or a feeling of fullness. Sedation is usually not needed, making recovery faster.
Preparation is simpler than a colonoscopy. Usually, only an enema or mild laxative is required to clean the lower colon. Some doctors may also suggest a clear liquid diet for a short time before the procedure.
A sigmoidoscopy generally takes 10–20 minutes, and you can return to your normal routine shortly after.
The procedure is safe and complications are rare. Some patients may have mild cramping, bloating, or slight bleeding (especially after a biopsy or polyp removal). Serious risks like colon perforation are extremely uncommon.