Flexible Sigmoidoscopy at United Gastroenterology Associates
At United Gastroenterology Associates, we are dedicated to providing the best diagnostic and preventive care for your digestive health. One of the effective procedures we offer is Flexible Sigmoidoscopy, a minimally invasive test used to examine the lower part of your colon (sigmoid colon) and rectum. This procedure helps in diagnosing and preventing a wide range of gastrointestinal conditions, including colorectal cancer.
What is Flexible Sigmoidoscopy?
Flexible Sigmoidoscopy is a diagnostic procedure that uses a thin, flexible tube called a sigmoidoscope, which is inserted through the rectum to examine the lower colon. The scope has a tiny camera at the tip, allowing your doctor to get a detailed view of the lining of your rectum and sigmoid colon. The procedure is often used to detect issues like polyps, inflammation, bleeding, and cancer.
Unlike a full colonoscopy, which examines the entire colon, Flexible Sigmoidoscopy focuses on the lower third of the colon, making it a quick and effective way to screen for certain conditions.
Why is Flexible Sigmoidoscopy Performed?
Your doctor may recommend Flexible Sigmoidoscopy to investigate and diagnose the following symptoms:
- Chronic diarrhea
- Rectal bleeding
- Abdominal pain
- Unexplained changes in bowel habits
- Persistent constipation
This procedure is also used as a screening tool for detecting early signs of colorectal cancer, particularly for individuals who may not need a full colonoscopy or those over the age of 50.

Conditions Diagnosed with Flexible Sigmoidoscopy
- Polyps – Small growths in the colon that can become cancerous if left untreated.
- Colorectal Cancer – Early detection of cancer in the lower colon and rectum.
- Diverticulosis and Diverticulitis – Small pouches in the colon that can become inflamed or infected.
- Ulcerative Colitis – Chronic inflammation of the colon, leading to sores and discomfort.
- Hemorrhoids – Swollen veins in the rectum that can cause pain and bleeding.
- Rectal Inflammation – Identifying and treating the cause of inflammation and bleeding.
What to Expect During Flexible Sigmoidoscopy
At United Gastroenterology Associates, we aim to make your experience as comfortable as possible. Here’s what you can expect:
- Preparation: Before the procedure, you will need to perform a bowel cleansing routine, typically using an enema, to clear the lower colon. This ensures that your doctor gets a clear view during the exam.
- The Procedure: During the Flexible Sigmoidoscopy, you’ll be asked to lie on your side. The procedure typically takes 10 to 20 minutes. The sigmoidoscope is gently inserted into the rectum and advanced into the lower part of the colon. The camera at the tip transmits real-time images to a monitor, allowing your doctor to carefully examine the colon lining.
- After the Procedure: Once the procedure is complete, you can usually resume your normal activities right away. Some patients may experience mild cramping or bloating for a short time, but these symptoms usually subside quickly.
Benefits of Flexible Sigmoidoscopy
- Minimally invasive: The procedure is quick and involves little to no discomfort.
- Early detection: Detecting polyps, cancer, and other abnormalities early can help prevent the development of more serious conditions.
- Fast recovery: You can return to your normal routine immediately after the procedure.
- Focused examination: Targets the lower part of the colon, where many common issues occur.
Why Choose United Gastroenterology Associates for Flexible Sigmoidoscopy?
At United Gastroenterology Associates, our board-certified gastroenterologist, Dr. Muhammad Ali Khan, is highly skilled in performing Flexible Sigmoidoscopy with care and precision. Dr. Khan, who completed his Internal Medicine residency at the University of Toledo and a fellowship in Gastroenterology and Hepatology at the University of Tennessee, has an outstanding reputation in the field. With over 100 peer-reviewed articles and recognition as one of Houston’s most cited gastroenterologists, Dr. Khan provides top-quality care to ensure you receive the best possible outcomes.
Conveniently Located in Cypress and Katy
Our clinic is located in Cypress and Katy, serving the greater Houston, The Woodlands, Spring, Richmond, and Fulshear areas. We accept most major insurance plans to ensure accessible and affordable care for all our patients.
Take Control of Your Digestive Health Today!
If you’re experiencing digestive issues or need a routine screening, contact United Gastroenterology Associates today to schedule your Flexible Sigmoidoscopy. We are here to provide expert care and peace of mind for your digestive health.
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Dr. Muhammad Ali Khan MD, FACP, FASGE
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