Sigmoidoscopy

What Sigmoidoscopy Means

Sigmoidoscopy is a medical test that allows doctors to look inside the lower part of your large intestine, specifically the rectum and the sigmoid colon, which is the last section before the rectum. The test uses a thin, flexible tube called a sigmoidoscope that has a light and a tiny camera on the end. This lets the doctor see the lining of these parts of your bowel to check for any problems. Sometimes, the doctor can also use small tools through the tube to remove tissue samples (biopsies) or polyps (growths) for further testing.

Why Sigmoidoscopy Can Matter in Cancer Care

Sigmoidoscopy is important because it helps find early signs of colorectal cancer and other bowel diseases. Colorectal cancer often starts as small growths called polyps, which can sometimes turn into cancer over time. By finding and removing these polyps early, sigmoidoscopy can help prevent cancer from developing. It is also used to investigate symptoms like bleeding from the anus, changes in bowel habits, abdominal pain, or unexplained weight loss, which might be signs of cancer or other conditions. Although sigmoidoscopy only examines the lower part of the colon, this area is where colorectal cancer commonly begins.

What to Expect During and After the Test

Before the test, you will need to prepare by emptying your colon. This usually means following a clear liquid diet for 12 to 24 hours and taking laxatives or enemas to clean out your bowel. During the procedure, you will lie on your side while the doctor gently inserts the sigmoidoscope into your rectum and slowly moves it into the sigmoid colon. The scope inflates the colon with air to give a better view. The test usually takes 10 to 20 minutes and does not require sedation. You might feel pressure, mild cramping, or bloating during or shortly after the test, but these feelings usually pass quickly.

Where You Might Hear or See the Term Sigmoidoscopy

You may come across the term sigmoidoscopy in your medical records, test results, treatment plans, or when discussing symptoms with your doctor. It might also appear as proctosigmoidoscopy or flexible sigmoidoscopy. Sometimes, it is mentioned alongside related tests like colonoscopy (which examines the entire colon) or virtual colonoscopy (a CT scan-based imaging test). Understanding these terms can help you follow your care plan and ask informed questions.

What Sigmoidoscopy Does Not Automatically Mean

Having a sigmoidoscopy does not mean you have cancer. It is a diagnostic and screening tool used to find out why you might have certain symptoms or to check for early signs of disease. Also, because sigmoidoscopy only looks at the lower part of the colon, it cannot detect problems in the upper parts. If needed, your doctor may recommend a full colonoscopy for a more complete examination.

Questions You Can Ask Your Care Team

You might want to ask why sigmoidoscopy is recommended for you, how to prepare properly, what the test will involve, and what the results could mean. It is also helpful to ask about the risks, what happens if polyps or abnormal tissue are found, and how often you should have this test if it is part of your cancer screening plan.

Understanding the Information and Next Steps

This information about sigmoidoscopy is meant to help you understand the test and its role in your care. It does not replace advice from your doctor, who knows your personal health situation best. If you have questions or concerns about sigmoidoscopy or colorectal cancer screening, the best next step is to talk with your healthcare provider. They can explain what is right for you and help you prepare for the test if needed.