Gastroenterology Associates of Texas
We Work With Most Major Providers
We are in-network with most major insurance carriers.
Contact our office to verify your specific coverage.
Comprehensive Care for
Digestive Conditions
Digestive disorders can affect people in very different ways. Care begins with understanding your symptoms, health history and risk factors before recommending diagnostic testing or an individualized treatment plan.
Gastroesophageal
Reflux Disease
GERD occurs when stomach contents repeatedly flow back into the esophagus. Care may include lifestyle measures, medication and further evaluation when symptoms persist or warning signs are present.
Colon Polyps
Colon polyps are growths that develop along the lining of the colon. Some types may become cancerous over time, which is why appropriate screening, removal and surveillance are important.
Crohn’s Disease
Crohn’s disease is a chronic inflammatory bowel disease that can affect any part of the digestive tract. It may cause persistent diarrhea, abdominal pain, rectal bleeding, fatigue, reduced appetite, and unintended weight loss.
Ulcerative Colitis
Ulcerative colitis causes ongoing inflammation in the lining of the colon and rectum. Care may involve medication, monitoring and coordination with other specialists when necessary.
Diverticular Disease
Diverticula are small pouches that may develop in the colon wall. They often cause no symptoms, but inflammation or complications may require medical evaluation and treatment.
Peptic Ulcer Disease
Peptic ulcers are open sores affecting the stomach or upper small intestine. Evaluation may consider H. pylori, medication use and other factors before treatment is selected.
Liver, Biliary
& Pancreatic Disorders
Symptoms or abnormal test results involving the liver, bile ducts, gallbladder or pancreas may require targeted laboratory testing, imaging or endoscopic evaluation.
Functional Digestive
Disorders
Some gastrointestinal symptoms occur without visible structural disease. These symptoms are real and may require a thoughtful approach based on their pattern, possible triggers and effect on daily life.
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1 of 8 Conditions
Gastroesophageal Reflux Disease
GERD occurs when stomach contents repeatedly flow back into the esophagus. Care may include lifestyle measures, medication and further evaluation when symptoms persist...
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2 of 8 Conditions
Colon Polyps
Colon polyps are growths that develop along the lining of the colon. Some types may become cancerous over time, which is why appropriate screening, removal and surveillance are important.
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3 of 8 Conditions
Crohn’s Disease
Crohn’s disease is a chronic inflammatory bowel disease that can affect any part of the digestive tract. It may cause persistent diarrhea, abdominal pain, rectal bleeding, fatigue, reduced appetite, and unintended weight loss.
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4 of 8 Conditions
Ulcerative Colitis
Ulcerative colitis causes ongoing inflammation in the lining of the colon and rectum. Care may involve medication, monitoring and coordination with other specialists when necessary.
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5 of 8 Conditions
Diverticular Disease
Diverticula are small pouches that may develop in the colon wall. They often cause no symptoms, but inflammation or complications may require medical evaluation and treatment.
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6 of 8 Conditions
Peptic Ulcer Disease
Peptic ulcers are open sores affecting the stomach or upper small intestine. Evaluation may consider H. pylori, medication use and other factors before treatment is selected.
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7 of 8 Conditions
Liver, Biliary & Pancreatic Disorders
Symptoms or abnormal test results involving the liver, bile ducts, gallbladder or pancreas may require targeted laboratory testing, imaging or endoscopic evaluation.
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8 of 8 Conditions
Functional Digestive Disorders
Some gastrointestinal symptoms occur without visible structural disease. These symptoms are real and may require a thoughtful approach based on their pattern, possible triggers...
Procedures & Diagnostic Services
When testing is appropriate, endoscopic procedures can help examine the digestive tract, investigate symptoms, collect tissue samples & in selected cases, provide treatment. Dr. Shannon recommends procedures according to each patient’s symptoms, history & clinical needs.
Colonoscopy
A colonoscopy allows the lining of the colon & rectum to be examined using a flexible camera. It may be recommended for colorectal cancer screening, polyp surveillance or evaluation of bleeding & changes in bowel habits.
Upper Endoscopy
Upper endoscopy, also called EGD, examines the esophagus, stomach & first portion of the small intestine. It may help evaluate persistent reflux, swallowing difficulty, upper abdominal pain, nausea or gastrointestinal bleeding.
ERCP
ERCP is a specialized endoscopic procedure used in selected cases to diagnose & treat problems involving the bile ducts or pancreatic ducts, including certain obstructions or stones. Because it is an invasive procedure, its potential benefits & risks are considered carefully.
Flexible Sigmoidoscopy
Flexible sigmoidoscopy examines the rectum & lower portion of the colon. It may be used to investigate symptoms or monitor certain lower gastrointestinal conditions.
Colonoscopy
A colonoscopy allows the lining of the colon & rectum to be examined using a flexible camera. It may be recommended for colorectal cancer screening, polyp surveillance or evaluation of bleeding & changes in bowel habits.
Upper Endoscopy
Upper endoscopy, also called EGD, examines the esophagus, stomach & first portion of the small intestine. It may help evaluate persistent reflux, swallowing difficulty, upper abdominal pain, nausea or gastrointestinal bleeding.
ERCP
ERCP is a specialized endoscopic procedure used in selected cases to diagnose & treat problems involving the bile ducts or pancreatic ducts, including certain obstructions or stones. Because it is an invasive procedure, its potential benefits & risks are considered carefully.
Flexible Sigmoidoscopy
Flexible sigmoidoscopy examines the rectum & lower portion of the colon. It may be used to investigate symptoms or monitor certain lower gastrointestinal conditions.
Meet Your Providers
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Meet
Dr. Gregory Shannon
Board Certified in Gastroenterology Diplomate, American Board of Internal Medicine
& Subspecialty Board in GastroenterologyDr. Gregory Shannon provides adult gastroenterology care for patients experiencing symptoms & conditions affecting the digestive tract, colon, liver, biliary system & pancreas. His clinical interests include colon cancer prevention, colon polyps, Crohn's disease & ulcerative colitis.
Dr. Shannon earned his medical degree from Northwestern University Medical School & completed postgraduate training at Baylor College of Medicine. His approach begins with listening carefully, explaining the available findings & helping each patient understand the appropriate options for evaluation and treatment.
Residency & Fellowship
Medical School
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Meet
Rhoda Olatayo, MSN
Nurse Practitioner, APRN, FNP-C Gastroenterology Associates of TexasRhoda Olatayo is a nurse practitioner who provides adult gastroenterology care at Gastroenterology Associates of Texas, working alongside Dr. Gregory Shannon. She guides patients through screenings and preventive care, and she builds treatment plans for digestive symptoms that are getting in the way of daily life.
Rhoda has spent more than ten years in the medical field. She began her career as a medical-surgical nurse, moved into the ICU, and then specialized in gastroenterology. Caring for patients with a wide range of conditions and backgrounds across those settings informs how she practices today. She listens fully before advising and explains findings in plain language, so no patient leaves without a clear next step.
Why Choose Dr. Gregory Shannon
Clear Answers Begin with a Careful Conversation
Digestive symptoms can be uncomfortable to discuss & frustrating to manage. Our goal is to create a respectful environment where you can speak openly about your concerns, understand what may be contributing to your symptoms and participate in decisions about your care.
Every patient’s situation is different. Recommendations are based on your symptoms, medical history, examination, & when needed, appropriate diagnostic testing.
- A thorough review of symptoms & medical history
- Clear explanations of recommended testing
- Individualized treatment planning
- Ongoing management for chronic digestive conditions
Patient Testimonials
What Our Patients Are Saying
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The staff was great--friendly, efficient, answered all my questions, concerns. Didn't meet Dr. Shannon until the actual procedure, but heard great things about him. He greeted me warmly and put me at ease just before the twilight sleep kicked in. He was recommended by my women's health physician, and she's one of his patients, so I figured I couldn't go wrong. I felt like I was in good hands.
~ J R ~
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I’ve just had a colonoscopy from Dr Shannon and had a great experience. This is my second time with him but it’s been awhile. His staff was amazing I went to the surgery center at MHSL and found it just great.
~ H M ~
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Dr Shannon is a very nice polite and awesome Dr. Spends time with you and makes sure he speaks to you before getting put under. I liked that. Explains his finds and concerns. The hospital called the next day to check on me also. His staff was very nice.
~ D M ~
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An Excellent Doctor! He is very kind and very knowledgeable. But I heard that his staff at Houston is rude. I went to his office at Memorial Herrmann Hospital in Sugar Land. The staff at Sugar Land was very kind and helpful.
~ R S ~
Patient Info
Patient Education Videos
& Resources
Faqs
When should I see a gastroenterologist?
You should consider seeing a gastroenterologist if you have persistent or recurring digestive symptoms that do not improve or are affecting your daily life. Common reasons to see a gastroenterologist include ongoing abdominal pain, frequent heartburn or acid reflux, persistent bloating, changes in bowel habits, chronic diarrhea or constipation, blood in the stool, difficulty swallowing, or unexplained weight loss.
A gastroenterologist can evaluate digestive symptoms and help determine whether further testing or treatment is needed. If you are experiencing a significant or prolonged change in your bowel habits or other concerning digestive symptoms, contact your healthcare provider for an evaluation.
What does a gastroenterologist treat?
A gastroenterologist diagnoses and treats conditions affecting the digestive system, including the esophagus, stomach, intestines, colon, liver, gallbladder, and pancreas. Patients may see a gastroenterologist for symptoms such as abdominal pain, bloating, heartburn, constipation, diarrhea, rectal bleeding, nausea, or changes in bowel habits.
This is a strong broad query because it lets you naturally cover multiple GI symptoms. Digestive symptoms such as bloating, constipation, diarrhea, heartburn, abdominal pain, nausea, and swallowing problems are recognized as common signs of digestive disorders.
What conditions does Dr. Gregory Shannon treat?
Dr. Gregory L. Shannon, MD is a top gastroenterologist practicing with Gastroenterology Associates of Texas, diagnosing and treating conditions affecting the digestive system. As a leading Black GI doctor serving the greater Houston area, his clinical interests include conditions of the colon, colon polyps, colon cancer, Crohn’s disease, and ulcerative colitis. Dr. Shannon provides comprehensive gastroenterology care to patients in Sugar Land, Texas, and surrounding communities.
If you are experiencing ongoing digestive symptoms or have been referred for evaluation of a gastrointestinal condition, contact Gastroenterology Associates of Texas to discuss your care needs.
What insurance plans does Gastroenterology Associates of Texas accept?
Gastroenterology Associates of Texas accepts a range of commercial, Medicare, Medicare Advantage, and other health insurance plans. Accepted plans include Blue Cross Blue Shield, UnitedHealthcare, Aetna, Cigna, Humana, Medicare, and other participating plans.
Because insurance networks and individual plan benefits can change, participation with an insurance carrier does not necessarily mean every plan is in-network. Contact our office with your insurance company, member ID, and group number so our team can help verify your coverage and benefits.
For the complete list of accepted insurance plans, please visit our Insurance & Billing FAQs.
Location
& Directions Gastroenterology Care
Conveniently Located in Sugar Land
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Gastroenterology Associates of Texas
Hours:
Monday-Friday: 8:00 AM - 5:00 PM
