Expert Colonoscopy Care Serving Houston
Colonoscopy Serving Houston, TX & Greater Houston
Looking for a colonoscopy in Houston, TX? United Gastroenterology Associates provides colonoscopy evaluation and digestive care for patients throughout Houston and Greater Houston, with convenient office locations in Cypress and Katy, Texas.
A colonoscopy may be recommended for colorectal cancer screening, follow-up of previous findings, or evaluation of certain digestive symptoms. Whether you are due for routine screening or have symptoms requiring further evaluation, a gastroenterologist can review your medical history and help determine the appropriate next steps.
Our practice serves Houston-area patients from two convenient locations:
Cypress Office
21216 Northwest Freeway, Suite 640
Cypress, TX 77429
Katy Office
23920 Katy Freeway, Suite 555
Katy, TX 77494
Call (346) 340-4414 to schedule an appointment.
If you are searching for a colonoscopy in Houston, colonoscopy near Houston, screening colonoscopy Houston, or a gastroenterologist for colonoscopy, schedule a consultation to discuss your individual screening and digestive health needs.

Colonoscopy for Houston and Greater Houston Patients
A colonoscopy is a procedure that allows a gastroenterologist to examine the inside of the colon and rectum.
The procedure may be recommended for different reasons. For some patients, colonoscopy is part of preventive colorectal cancer screening. For others, it may be used to evaluate certain symptoms, follow up on abnormal test results, or monitor specific gastrointestinal conditions.
Your reason for needing a colonoscopy depends on factors such as:
- Age
- Personal medical history
- Family history
- Previous colonoscopy findings
- Presence of symptoms
- Results of other tests
- Individual colorectal cancer risk factors
A gastroenterologist can review these factors and recommend the appropriate screening or diagnostic plan.
Learn more about our Houston-area gastroenterology care and screening colonoscopy services.
Common Gastritis Symptoms
Upper stomach pain, burning stomach pain, sour stomach, nausea, bloating after eating, indigestion, feeling full quickly, and loss of appetite are common signs of gastritis.
What Causes Gastritis?
Common causes include H. pylori infection, frequent NSAID pain relievers, alcohol, bile reflux, and autoimmune gastritis, among other digestive conditions.
When to See a GI Doctor
See a gastroenterologist if symptoms are persistent, worsening, or not improving, or if you have a history of ulcers or H. pylori or long-term NSAID use with stomach pain. Need Consultation!
Board-Certified Gastroenterology Excellence
Gastroenterologist in Greater Houston
Dr. Muhammad Ali Khan, MD, FACP, FASGE

At the heart of our practice is Dr. Muhammad Ali Khan, a highly respected, board-certified gastroenterologist and hepatologist with extensive experience in diagnosing and treating diseases of the digestive system and liver.
Dr. Khan earned his medical degree from Dow Medical College, completed his Internal Medicine residency at the University of Toledo, and went on to complete advanced fellowship training in Gastroenterology and Hepatology at the University of Tennessee.
Throughout his distinguished career, Dr. Khan has combined outstanding clinical care with academic excellence. He previously served as an Associate Professor at MD Anderson Cancer Center, where he participated in the care of patients with complex gastrointestinal conditions and gastrointestinal cancers while contributing to medical education and research.
Dr. Khan has authored more than 100 peer-reviewed scientific publications and has presented research at national and international medical conferences. His work has contributed to clinical practice guidelines and continues to influence the field of gastroenterology.
As a Fellow of both the American College of Physicians (FACP) and the American Society for Gastrointestinal Endoscopy (FASGE), Dr. Khan remains committed to delivering evidence-based, patient-focused care using the latest advancements in digestive medicine.
. He is an active member of several professional organizations, including the American College of Gastroenterology and the Texas Medical Association. Learn more..
Colonoscopy Screening for Greater Houston
What Is a Colonoscopy?
A colonoscopy is an examination of the large intestine, also called the colon, and the rectum.
During the procedure, a gastroenterologist uses a flexible instrument called a colonoscope to examine the lining of the colon.
Depending on the reason for the procedure and the findings, additional steps may be taken during colonoscopy when medically appropriate. These can include obtaining tissue samples or removing certain polyps.
A colonoscopy is commonly associated with colorectal cancer screening, but it can also be used for diagnostic evaluation.
Why Might You Need a Colonoscopy?
There are several reasons a gastroenterologist may recommend a colonoscopy.
1. Colorectal Cancer Screening
Screening aims to detect certain abnormalities before symptoms develop or identify colorectal cancer at an earlier stage.
Screening recommendations vary based on age and individual risk factors.
Factors that may affect your screening plan include:
- Family history of colorectal cancer
- Personal history of colon polyps
- Personal history of colorectal cancer
- Inflammatory bowel disease
- Certain inherited conditions
- Previous screening results
Your gastroenterologist can help determine which screening approach and timing are appropriate for you.
Learn more about colorectal cancer screening.
2. Evaluation of Blood in the Stool or Rectal Bleeding
Blood in the stool or rectal bleeding can have different causes.
Depending on your symptoms and medical history, a gastroenterologist may recommend additional evaluation.
For more information, visit our blood in stool and rectal bleeding care.
3. Changes in Bowel Habits
Persistent changes in bowel habits may require medical evaluation.
These changes can include:
- New or persistent constipation
- Ongoing diarrhea
- Changes in stool appearance
- A persistent change in your usual bowel pattern
Not every change requires a colonoscopy, but your gastroenterologist can determine whether further testing is appropriate.
Learn more about constipation.
4. Unexplained Digestive Symptoms
Depending on the patient's overall clinical situation, colonoscopy may be considered when evaluating certain symptoms, including:
- Persistent lower abdominal discomfort
- Chronic diarrhea
- Unexplained bleeding
- Certain changes in bowel habits
- Unexplained anemia
The appropriate evaluation depends on the individual patient.
5. Follow-Up After Previous Polyps or Findings
Patients with a history of polyps or other colonoscopy findings may need follow-up based on the nature of their previous results.
Your gastroenterologist can review your prior records and recommend an appropriate follow-up plan.
Trusted Colonoscopy Care Near Houston
Colonoscopy vs. Screening Colonoscopy
Not every colonoscopy is performed for the same reason.
Screening Colonoscopy
A screening colonoscopy is generally performed as part of preventive care for an eligible patient who may not have symptoms suggesting a specific digestive problem.
The purpose is to screen for colorectal cancer and certain precancerous abnormalities.
Diagnostic Colonoscopy
A diagnostic colonoscopy may be performed when there are symptoms, abnormal findings, or other medical reasons requiring further evaluation.
Examples may include bleeding, anemia, persistent changes in bowel habits, or other symptoms.
Your insurance coverage and patient costs may differ depending on how a procedure is classified. Contact your insurance company and healthcare team for information specific to your situation.
When Should You Schedule Colorectal Cancer Screening?
The appropriate timing for colorectal cancer screening depends on your individual risk.
Factors considered may include:
- Your age
- Family history
- Personal history of polyps
- Previous colorectal cancer
- Inflammatory bowel disease
- Genetic risk factors
- Previous screening results
Current recommendations can change, and the right screening plan is not identical for every patient.
A gastroenterologist can discuss your individual risk factors and determine the appropriate screening approach.
For more information, visit our colorectal cancer screening page.

Advanced GI Care for Houston-Area Patients
What Happens Before a Colonoscopy?
Your Partner in Colon Health
Before your procedure, your healthcare team reviews relevant medical information and provides preparation instructions.
You may be asked about:
- Current medications
- Vitamins and supplements
- Allergies
- Previous surgeries
- Previous colonoscopy findings
- Medical conditions
- Family history
- Current symptoms
Your team will also provide instructions for preparing your bowel before the procedure.
It is important to follow your instructions carefully because adequate preparation helps the gastroenterologist properly examine the colon.
Do not stop prescription medications without instructions from your healthcare team.

Acute Gastritis
Sudden stomach inflammation, often from infection, medications, alcohol, or illness.

Chronic Gastritis
Inflammation that develops slowly or keeps returning over time.

H. pylori Gastritis
Gastritis caused by Helicobacter pylori bacteria infecting the stomach lining.

Reactive & Autoimmune Gastritis
Irritation from NSAIDs, alcohol, or bile reflux, or an immune attack on the lining.
Comprehensive Colonoscopy Care, Close to Houston
Colonoscopy Preparation Instructions
A clean colon is important for an effective examination.
Your exact preparation instructions may vary depending on the bowel preparation prescribed for you.
Our website provides resources for several preparation options.
Visit our Colonoscopy Preparation Center for general and prescription-specific instructions.
Available information includes:
- General Colonoscopy Instructions
- Clenpiq Preparation Instructions
- Sutab Preparation Instructions
- Suprep Preparation Instructions
Always follow the specific instructions provided for your procedure.
What Happens During a Colonoscopy?
During a colonoscopy, a gastroenterologist uses a flexible instrument called a colonoscope to examine the lining of the colon and rectum.
The procedure process, sedation plan, length of the appointment, and recovery instructions can vary depending on the patient and procedure facility.
If abnormalities such as certain polyps are identified, they may sometimes be removed during the procedure when medically appropriate.
Tissue samples may also be collected when needed for laboratory analysis.
Your procedure team will explain what to expect before your appointment.
Recovery After a Colonoscopy
After your colonoscopy, you will receive recovery and discharge instructions based on your procedure.
Your healthcare team will discuss:
- Immediate findings, when appropriate
- Whether tissue samples were obtained
- Follow-up recommendations
- When you may return to normal activities
- Medication instructions
- Transportation requirements, if applicable
If tissue samples are sent to a laboratory, final results may require additional processing time.
Follow the specific instructions provided by your healthcare and procedure team.
Colonoscopy in Houston, TX or Near Houston?
United Gastroenterology Associates provides colonoscopy and GI care for patients from Houston and the Greater Houston area, with physical office locations in Cypress and Katy.
This means that if you are searching for a:
- Colonoscopy Houston
- Colonoscopy Houston TX
- Colonoscopy near Houston
- Houston colonoscopy doctor
- Gastroenterologist for colonoscopy Houston
- Screening colonoscopy near me
- Colonoscopy specialist near Houston
you can schedule an appointment at the location that is most convenient for you.
Colonoscopy in Cypress
Our Cypress location is convenient for patients in Cypress and nearby Northwest Houston communities.
Learn more about Colonoscopy in Cypress, TX.
Colonoscopy in Katy
Our Katy location is convenient for patients in Katy and surrounding West Houston communities.
Learn more about Colonoscopy in Katy, TX.
For all office details, visit our Locations page.
Why See a Gastroenterologist for a Colonoscopy?
A colonoscopy is part of a broader approach to digestive health.
A gastroenterologist can evaluate why a procedure may be needed and consider factors such as:
- Symptoms
- Personal history
- Family history
- Previous testing
- Previous colonoscopy findings
- Colorectal cancer risk factors
This helps determine whether colonoscopy or another approach is appropriate and what follow-up may be needed.
Meet Dr. Muhammad Ali Khan, Gastroenterologist and Hepatologist.
You can also learn more about our gastroenterology services.
Other Digestive Health Services
In addition to colonoscopy, patients may seek care for other digestive symptoms and conditions.
Upper Endoscopy and EGD
Upper endoscopy examines the esophagus, stomach, and duodenum.
Learn more about:
Digestive and Liver Care
We also evaluate a broad range of gastrointestinal and liver conditions.
Explore our:
Testimonial
Patient Reviews
Our practice is proud to receive consistently positive feedback for compassionate care, thorough evaluations, and excellent patient communication.
★★★★★
"Dr. Khan took the time to explain everything clearly. I never felt rushed and finally understood the cause of my digestive problems."
★★★★★
"My colonoscopy experience was much easier than I expected. The staff made me feel comfortable from beginning to end."
★★★★★
"Professional, caring, and extremely knowledgeable. I highly recommend Dr. Khan for anyone experiencing digestive issues."
★★★★★
"Scheduling was easy, the office was organized, and Dr. Khan answered every one of my questions."
★★★★★
"Excellent experience. I would absolutely recommend United Gastroenterology to family and friends."
Our greatest compliment is the trust our patients place in us by referring their friends and family members for digestive care.
Screening Today for Better Health Tomorrow
Schedule a Colonoscopy Consultation Serving Houston and Greater Houston
If you are due for colorectal cancer screening, have a history of colon polyps, or are experiencing symptoms that may require further evaluation, schedule a consultation with a gastroenterologist.
United Gastroenterology Associates serves patients throughout Houston and Greater Houston from convenient offices in:
Cypress, TX
21216 Northwest Freeway, Suite 640
Cypress, TX 77429
Katy, TX
23920 Katy Freeway, Suite 555
Katy, TX 77494
Call (346) 340-4414 to schedule an appointment.
FAQs
Frequently Asked Questions
What is a colonoscopy?
A colonoscopy is a procedure that allows a gastroenterologist to examine the inside of the colon and rectum.
Where can I schedule a colonoscopy near Houston?
United Gastroenterology Associates serves Houston-area patients from offices in Cypress and Katy, Texas. Visit our Locations page to choose the office most convenient for you.
Is a colonoscopy used for colorectal cancer screening?
Yes. Colonoscopy is one method that may be used for colorectal cancer screening. The appropriate screening method and timing depend on individual risk factors.
When should I get a screening colonoscopy?
The appropriate timing depends on factors including age, family history, personal medical history, and previous screening results. A gastroenterologist can discuss recommendations based on your individual risk.
Do I need a colonoscopy if I have blood in my stool?
Blood in the stool can have multiple causes. Depending on your symptoms and medical history, your gastroenterologist may recommend colonoscopy or another evaluation.
What is the difference between a screening and diagnostic colonoscopy?
A screening colonoscopy is generally performed as preventive screening, while a diagnostic colonoscopy is performed to evaluate symptoms or abnormal findings. Individual circumstances and insurance classification may vary.
How do I prepare for a colonoscopy?
You will receive instructions specific to your prescribed preparation. Visit our Colonoscopy Preparation Center for available preparation resources.
Can polyps be removed during a colonoscopy?
Depending on the findings and clinical situation, certain polyps may be removed during the procedure.



