Sigmoidoscopy

A sigmoidoscopy is a minimally invasive diagnostic procedure used to examine the lower part of the large intestine, including the rectum and sigmoid colon. It is an important tool for evaluating symptoms such as rectal bleeding, changes in bowel habits, unexplained abdominal discomfort, and other conditions affecting the lower digestive tract.

During the procedure, a specialist uses a thin, flexible instrument called a sigmoidoscope, which has a small camera and light at its tip. The instrument is gently inserted through the anus and guided into the rectum and sigmoid colon. This allows the doctor to view the lining of the bowel directly and identify abnormalities that may not be detected through routine examinations or imaging tests.

Why Is a Sigmoidoscopy Performed?

Your doctor may recommend a sigmoidoscopy when you have symptoms or findings that require a closer examination of the lower bowel. The procedure can help identify the cause of several gastrointestinal problems and may also be used to monitor previously diagnosed conditions.

Common reasons for undergoing a sigmoidoscopy include:

• Unexplained rectal bleeding or blood in the stool
• Persistent changes in bowel habits
• Ongoing diarrhoea or constipation
• Unexplained pain or discomfort in the lower abdomen
• Suspected inflammation of the colon or rectum
• Evaluation of inflammatory bowel conditions
• Investigation of abnormal findings from other tests
• Follow-up of previously identified bowel abnormalities
• Assessment of polyps or other growths in the lower colon

A sigmoidoscopy can also allow the doctor to take a biopsy, which involves removing a small sample of tissue for laboratory examination. If a polyp or certain other abnormalities are identified, they may sometimes be removed during the same procedure, depending on their size, location, and characteristics.

What Happens During a Sigmoidoscopy?

Before the procedure, you will receive instructions about preparing your bowel. Proper preparation is important because stool remaining in the bowel can make it difficult for the doctor to see the intestinal lining clearly. Your healthcare team will explain exactly what you need to do before the examination.

During the procedure, you will generally be positioned on your side. The sigmoidoscope is carefully passed through the anus and into the lower part of the colon. A small amount of air or carbon dioxide may be introduced into the bowel to gently expand it, allowing the doctor to obtain a clearer view.

The camera at the end of the sigmoidoscope sends images to a monitor, enabling the doctor to examine the intestinal lining in detail. If necessary, instruments can be passed through the scope to obtain tissue samples or perform certain treatments.

You may experience some pressure, bloating, or cramping during the examination. These sensations are usually temporary. The medical team will monitor you throughout the procedure and ensure that you remain as comfortable as possible.

Preparation for Sigmoidoscopy

Good preparation helps ensure that the examination is accurate and complete. Depending on your individual circumstances, preparation may involve dietary restrictions, bowel-cleansing medication, or an enema before the procedure.

It is important to inform your doctor about any medications you take, particularly blood-thinning medicines, as well as any allergies or existing medical conditions. Your doctor will advise you whether any medications need to be adjusted before the procedure.

Following the preparation instructions carefully can help your doctor obtain the clearest possible view and may reduce the need to repeat the examination.

Benefits of Sigmoidoscopy

One of the major advantages of sigmoidoscopy is that it allows the doctor to directly examine the lining of the rectum and lower colon. This can provide valuable information when investigating symptoms or monitoring gastrointestinal conditions.

The procedure can help detect inflammation, ulcers, polyps, bleeding sources, abnormal tissue, and other changes. When appropriate, biopsies can be performed during the examination, allowing tissue to be assessed under a microscope.

Because sigmoidoscopy focuses on the lower portion of the large intestine, it can be particularly useful when symptoms are suspected to originate from this area.

Is Sigmoidoscopy Safe?

Sigmoidoscopy is generally considered a safe procedure when performed by a trained medical professional. As with any medical procedure, however, there are potential risks. These can include temporary abdominal discomfort, bloating, bleeding—particularly after a biopsy or polyp removal—and, rarely, injury or perforation of the bowel.

Your doctor will discuss the potential benefits and risks with you before the procedure and answer any questions you may have.

After the Procedure

Most patients can return to their usual activities relatively quickly after a sigmoidoscopy, depending on whether sedation was used and whether any additional procedure was performed. You may experience mild bloating or abdominal discomfort for a short period after the examination.

If a biopsy was taken, your doctor may explain when and how you will receive the results. Your healthcare team will also provide instructions regarding what symptoms to watch for after the procedure and when you should seek medical attention.

Expert Sigmoidoscopy Care

If you are experiencing persistent bowel symptoms, rectal bleeding, or other concerns involving the lower digestive tract, a sigmoidoscopy may provide important diagnostic information. Our approach focuses on appropriate evaluation, patient comfort, clear communication, and careful medical care throughout the procedure.

If your doctor has recommended a sigmo