Flexible Sigmoidoscopy
Expert Lower Bowel Examination

15 mins

Procedure duration

No Sedation

Usually not required

Same Day

Return to normal activities

Quick Results

Findings explained same day

β€” What is Flexible Sigmoidoscopy?

Understanding Flexible Sigmoidoscopy

Flexible sigmoidoscopy is a short, well-tolerated procedure used to examine the lower part of the large bowel, specifically the rectum and sigmoid colon. A thin, flexible tube with a camera is gently passed into the bowel to provide a clear, direct view of the lining. It is faster than colonoscopy and does not usually require full bowel preparation or sedation, making it an ideal first-line investigation for many lower bowel symptoms.

During the procedure, biopsies can be taken and small polyps removed. It is particularly valuable for investigating symptoms arising from the left side of the colon, the most common site for colorectal cancer and polyps.

β€” Why it is Performed

Indications

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Rectal Bleeding

Investigation of fresh rectal bleeding to identify the source, whether haemorrhoids, fissure, polyp, inflammation or tumour.

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Change in Bowel Habit

Persistent change in bowel frequency or consistency arising from the left colon or rectum.

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Polyp Surveillance

Surveillance of the rectum and sigmoid colon following previous polyp detection or resection.

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Suspected Proctitis

Assessment of rectal or sigmoid inflammation in suspected inflammatory bowel disease or infective colitis.

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Following Abnormal Imaging

Investigation following an abnormal finding on CT or MRI suggesting a left-sided colonic abnormality.

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Post-operative Assessment

Assessment of the bowel following rectal or sigmoid surgery, including examination of an anastomosis.

βš• Clinical Note

Flexible sigmoidoscopy examines only the lower bowel. If a complete colonic examination is required, for example, following a positive bowel cancer screening test, a full colonoscopy will be recommended instead.

β€” The Procedure

What to Expect

1

Preparation

A phosphate enema is administered approximately one hour before the procedure to clear the lower bowel. Full bowel preparation (as required for colonoscopy) is not usually necessary.

2

No Sedation Required

Flexible sigmoidoscopy is generally performed without sedation and is well tolerated. Entonox (gas and air) is available if required for comfort.

3

The Examination

Lying on your left side, the sigmoidoscope is gently advanced into the sigmoid colon. Air or carbon dioxide is introduced to open the bowel. The procedure takes approximately 15 minutes.

4

Biopsy and Treatment

Biopsies are taken from any areas of abnormality. Small polyps can be removed at the time. If a larger polyp or tumour is identified, a full colonoscopy will be arranged.

βš• Clinical Note

Because sedation is not routinely required, you can usually drive yourself home after the procedure and return to normal activities immediately. This makes flexible sigmoidoscopy a very convenient investigation.

β€” After the Procedure

Recovery and Results

Recovery after flexible sigmoidoscopy is rapid. Mild bloating or wind is common and settles within a few hours. The vast majority of patients feel entirely well immediately after the procedure.

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Immediate Findings

Mr Kumar will explain what was found during the procedure before you leave.

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Biopsy Results

Histology results are usually available within one to two weeks with a clear follow-up plan.

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Drive Home

No sedation means you can drive yourself home and return to work the same day in most cases.

β€” Colonoscopy vs Flexible Sigmoidoscopy

Which Procedure Do You Need?

The choice between the two procedures depends on your symptoms and clinical situation. As a guide:

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Flexible Sigmoidoscopy

Best for lower bowel symptoms, rectal bleeding, proctitis assessment, and post-operative follow-up. Fast, no sedation, same-day return to activities.

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Colonoscopy

Required when the entire colon needs examination, positive bowel cancer screening, unexplained anaemia, right-sided symptoms, or complete polyp surveillance.

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Mr Kumar Will Advise

At consultation, Mr Kumar will recommend the most appropriate investigation based on your symptoms, history and any previous results.

Book a Flexible Sigmoidoscopy

Fast, convenient lower bowel assessment in Birmingham. Book a consultation with Mr Kumar today.

Quick Facts

Procedure duration

~15 mins

Sedation

Not usually needed

Drive home

Same day

Biopsy results

1–2 weeks

Book a Consultation

Specialist opinion when it matters

Appointments typically within 3–5 working days.