Brookshire Cypress Jersey Village Katy
1.9K Reviews    |   
★ ★ ★ ★ ★
4.7 Star Rating    |    20+ years of experience    |    75k+ Patients Treated
Call
★ Add as preferred source

Flexible Sigmoidoscopy

Flexible sigmoidoscopy is a targeted lower-colon exam that helps evaluate rectal bleeding, inflammation, diarrhea, lower abdominal pain, and symptoms involving the rectum and sigmoid colon. As part of the GastroDoxs GutDefense Pathway™, patients can better understand why this exam may be recommended and how findings may guide follow-up care.

Dr. Bharat Pothuri Medically Reviewed by Dr. Bharat Pothuri, MD, FACG  |  Updated 03-24-2026
What to Expect Download Free Guide
Lower colon Rectum Targeted exam Board-Certified Gastroenterologist

What Is Flexible Sigmoidoscopy?

Flexible sigmoidoscopy is a procedure that uses a thin, flexible camera to examine the rectum and lower part of the colon, called the sigmoid colon.

It is more targeted than a full colonoscopy and may be recommended when symptoms appear to involve the lower colon or rectum.

The exam allows your GI doctor to see the lower colon lining directly. If inflammation, ulcers, abnormal tissue, or small polyps are seen, biopsies or treatment may be performed when clinically appropriate.

Understanding Flexible Sigmoidoscopy

The exam allows your GI doctor to see the lower colon lining directly. If inflammation, ulcers, abnormal tissue, or small polyps are seen, biopsies or treatment may be performed when clinically appropriate.

shield

GastroDoxs GutGuardians™

Your guardians. GastroDoxs GutGuardians™ is an elite team of board-certified gastroenterologists - a physician-led defense force of specialists, systems, and solution pathways working together to protect, detect, solve, and defend your digestive health through expert GI evaluation, advanced diagnostic screening, and endoscopic evaluation - commanded from your first concern to your last follow-up, and every critical stage in between.

route

GastroDoxs GutDefense Pathway™

Your complete arc. The GastroDoxs GutDefense Pathway™ is your complete operational framework - a structured patient journey that connects digestive health awareness, education, screening, prevention, diagnosis, and treatment into one seamless board-certified gastroenterologist-commanded arc, guided by expert GI care from your first concern to lasting gut health for life.

Why Is Flexible Sigmoidoscopy Done?

A doctor may recommend flexible sigmoidoscopy to evaluate symptoms or findings that may come from the rectum, sigmoid colon, or lower portion of the colon. The exam can help identify bleeding sources in the rectum or lower colon.

Rectal bleeding

Chronic diarrhea

Lower abdominal pain

Inflammation

Polyps

Biopsy

How Gastroenterologists Decide on Flexible Sigmoidoscopy

The decision to recommend Flexible Sigmoidoscopy is based on symptoms, medical history, exam findings, lab results, imaging, prior testing, medication response, and the goal of the evaluation. This helps ensure the procedure or test is clinically appropriate and connected to a clear next step.

What Can Flexible Sigmoidoscopy Help Evaluate?

Flexible sigmoidoscopy can help identify conditions affecting the rectum and lower colon. The exam may show inflammation, ulcers, or irritation in the lower colon or rectum.

Rectal bleeding

Chronic diarrhea

Lower abdominal pain

Inflammation

Polyps

Biopsy

How Results Are Interpreted

Results from Flexible Sigmoidoscopy are reviewed in context with your symptoms, risk factors, prior testing, and clinical history. Your gastroenterologist explains whether results suggest monitoring, treatment, additional testing, or follow-up care.

Flexible Sigmoidoscopy Alternatives and Related Testing

Flexible Sigmoidoscopy may be one part of a broader digestive health evaluation. Depending on the concern, alternatives or related tests may include blood work, stool testing, imaging, endoscopy, ultrasound-based testing, or follow-up monitoring. Your gastroenterologist helps choose the most appropriate option.

Who May Need Flexible Sigmoidoscopy

Your doctor may recommend Flexible Sigmoidoscopy based on symptoms, risk factors, prior test results, or the need for a clearer diagnosis.

Patients with Rectal bleeding

Patients with Chronic diarrhea

Patients with Lower abdominal pain

Patients with Inflammation

Patients with Polyps

Patients with Biopsy

How Is Flexible Sigmoidoscopy Different from Colonoscopy?

Flexible sigmoidoscopy checks the rectum and sigmoid colon. Colonoscopy examines the entire colon and may be better for screening or symptoms that could come from higher in the colon. Sigmoidoscopy focuses on the area where many rectal and lower-colon symptoms begin.

Patient Journey: Before Flexible Sigmoidoscopy, Many Patients Worry About Rectal Symptoms and Results

Many patients feel unsure before flexible sigmoidoscopy, especially when symptoms such as rectal bleeding, diarrhea, inflammation, or lower abdominal discomfort need evaluation.

The patient journey explains how symptoms are reviewed, what the exam may involve, and how findings can guide the next step in digestive care.

Read the Patient Experience →

Benefits of Flexible Sigmoidoscopy

Flexible Sigmoidoscopy can provide useful information about digestive or liver health and may help your gastroenterologist plan the next step.

Helps evaluate rectal bleeding

Helps evaluate chronic diarrhea

Helps evaluate lower abdominal pain

Helps evaluate inflammation

Helps evaluate polyps

Helps evaluate biopsy

Possible Risks of Flexible Sigmoidoscopy

Flexible Sigmoidoscopy is generally safe when performed or supervised by trained GI specialists, but every procedure or test has considerations based on your health history, medications, and reason for evaluation.

When Should You Talk to a GI Specialist?

Talk to a gastroenterologist if symptoms persist, results are unclear, or your doctor recommends Flexible Sigmoidoscopy for diagnosis, monitoring, or treatment planning.

Related Flexible Sigmoidoscopy Guides

Use these next-step pages when you are ready to understand preparation, scheduling, or related digestive health topics.

What to Expect

Learn preparation, procedure-day expectations, recovery, and how results may be discussed.

Schedule Flexible Sigmoidoscopy

Review appointment, location, insurance, and scheduling details.

Rectal bleeding

Learn how rectal bleeding may relate to digestive or liver evaluation.

Chronic diarrhea

Learn how chronic diarrhea may relate to digestive or liver evaluation.

Lower abdominal pain

Learn how lower abdominal pain may relate to digestive or liver evaluation.

Inflammation

Learn how inflammation may relate to digestive or liver evaluation.

Flexible Sigmoidoscopy Prep Overview

Quick Answer: What should adults know about Flexible Sigmoidoscopy prep?

Flexible Sigmoidoscopy preparation depends on the reason for the test, the setting, and your health history.

Follow the written instructions from your GastroDoxs care team, including medication guidance, arrival time, and transportation planning when sedation is used.

Flexible Sigmoidoscopy Procedure Instructions

Watch your GastroDoxs procedure instructions before your visit and follow the written preparation guide from your care team.

Where to Learn the Next Step

Want procedure-day details?Review the full guide for preparation, procedure-day expectations, recovery, and how results are discussed. Learn more
Ready to discuss scheduling?If Flexible Sigmoidoscopy may be appropriate, use the scheduling page to understand appointment options. Learn more

Frequently Asked Questions

Answers are reviewed for clinical accuracy based on standard gastroenterology practice guidelines.

What is flexible sigmoidoscopy?

Flexible sigmoidoscopy is a procedure that uses a thin, flexible camera to examine the rectum and lower part of the colon, called the sigmoid colon.

Why would a doctor recommend a flexible sigmoidoscopy?

A doctor may recommend it for rectal bleeding, chronic diarrhea, lower abdominal pain, inflammation, abnormal imaging, abnormal stool tests, or follow-up of known lower-colon disease.

What part of the colon does a flexible sigmoidoscopy examine?

It examines the rectum and sigmoid colon. It does not examine the entire colon, which is why colonoscopy may be recommended when a full evaluation is needed.

How is a flexible sigmoidoscopy different from a colonoscopy?

Flexible sigmoidoscopy checks the lower colon and rectum. Colonoscopy examines the entire colon and can be more appropriate for screening or symptoms that may come from higher in the colon.

I'm seeing blood in my stool — do I need a flexible sigmoidoscopy urgently?

Blood in the stool should be evaluated promptly. Seek emergency care for heavy bleeding, dizziness, weakness, severe pain, or black stools. A GI evaluation can determine whether sigmoidoscopy, colonoscopy, or another test is needed.

Why would you have a sigmoidoscopy instead of a colonoscopy?

Sigmoidoscopy may be used when symptoms appear limited to the rectum or lower colon, when a shorter targeted exam is appropriate, or when the doctor wants to evaluate known lower-colon disease.

How painful is a flexible sigmoidoscopy?

Most patients feel pressure, cramping, or gas rather than severe pain. Sedation needs vary by patient, procedure plan, and medical history.

Do you need bowel prep for sigmoidoscopy?

Yes. Preparation usually focuses on cleaning the lower colon and may include enemas, diet instructions, or other prep steps based on your doctor’s instructions.

Do they put you to sleep for a flexible sigmoidoscopy?

Some flexible sigmoidoscopies are done without full sedation, while others may use sedation for comfort. Your care team will explain the plan before the procedure.

How long does a flexible sigmoidoscopy take?

The exam itself is usually brief, often around 10 to 20 minutes. Total visit time may be longer because of check-in, preparation, recovery, and discharge instructions.

Need a Sigmoidoscopy Evaluation?

Schedule with GastroDoxs to discuss rectal bleeding, changes in bowel habits, abdominal symptoms, or screening needs and learn whether sigmoidoscopy is appropriate for your evaluation and treatment plan.

Learn What to Expect See Scheduling Options