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Upper Endoscopy (EGD)
Learn how an upper endoscopy (EGD) helps Dr. Colin Dunn evaluate reflux, swallowing problems, and stomach pain in Los Gatos and Silicon Valley.
What is an upper endoscopy?
An upper endoscopy is a procedure that lets a doctor look inside your upper digestive tract. It is also called an EGD. This test uses a thin, flexible tube with a tiny camera and light at the end. The camera sends images to a monitor so the doctor can see the lining of your esophagus, stomach, and the first part of your small intestine, called the duodenum.
How it works
A thin tube with a camera is gently guided through the mouth to view the lining of the esophagus, stomach, and small intestine.
What it measures
• The appearance of the lining in the esophagus and stomach
• The area where the esophagus meets the stomach
• Signs of inflammation, redness, or swelling
• Structural issues like narrowing or a hiatal hernia
• The presence of ulcers, abnormal tissue, or retained food
What it tells Dr. Dunn
• If there is visible damage from acid reflux
• Whether a physical blockage is causing trouble swallowing
• If a hiatal hernia is present and its visible anatomy
• Whether tissue samples are needed to check for infection or Barrett’s esophagus
• How the anatomy may affect planning for surgery
When is this test recommended?
Dr. Dunn may suggest an upper endoscopy if you have symptoms that suggest a problem in your upper digestive tract.
It helps identify visible injury, inflammation, or a hiatal hernia associated with GERD.
The test can find narrowing, scar tissue, or obstructions that make it hard for food to pass.
It allows the doctor to check for ulcers or inflammation in the stomach and small intestine.
Your procedure experience
Upper endoscopy is a common procedure designed to be as comfortable as possible for the patient.
During diagnostic endoscopy
• You will be positioned comfortably and given medicine to help you relax.
• A mouthguard is often used to protect your teeth and the scope.
• The doctor gently passes the scope through your mouth and down your throat.
• Air or gas may be used to help the doctor see the lining more clearly.
• Small tissue samples called biopsies may be taken if needed.
During surgery
While upper endoscopy is usually a separate diagnostic test, it is a vital part of planning for anti-reflux surgery or hiatal hernia repair. It helps Dr. Dunn understand your anatomy before a procedure. In some cases, it can also be used to evaluate the results of a prior surgery if symptoms return.
Most patients find the procedure straightforward and do not remember much of it due to the sedation used to help them stay comfortable.
Why this evaluation matters
Upper endoscopy is often the first step in understanding foregut symptoms. It provides a clear view of your anatomy and can rule out many structural problems. However, a normal endoscopy does not always mean there is no issue. If the structure looks normal, it may mean your symptoms are caused by how the organs function, which requires different types of testing like manometry or reflux monitoring.
Want to understand how this applies to your case?
Book a consultation and Dr. Dunn will walk you through exactly how EndoFLIP is used in your specific planned procedure.
Conditions evaluated with this test
Upper endoscopy is used to evaluate several conditions affecting the upper digestive tract.
Used in these procedures
• Gastroesophageal Reflux Disease (GERD)
• Hiatal Hernia
• Dysphagia (Difficulty Swallowing)
• Barrett’s Esophagus
• Stomach Ulcers or Gastritis
• Suspected Achalasia
Not used in these procedures
Upper endoscopy is a structural test and does not measure how well the muscles of the esophagus move or how much acid is entering the esophagus over time. It is not a replacement for functional tests like esophageal manometry or pH reflux testing when those details are needed for a full diagnosis.
Frequently Asked Questions
An upper endoscopy, also known as an EGD, uses a thin, flexible tube with a camera to examine the lining of the esophagus, stomach, and the first part of the small intestine. Dr. Dunn may recommend this procedure to evaluate symptoms such as chronic reflux, difficulty swallowing, or upper abdominal pain. The exam helps identify visible findings like inflammation, narrowing, or a hiatal hernia.
You will be asked to fast for a specific period before the procedure to keep the stomach empty for a safer and clearer exam. You should also review your medications, allergies, and health history with the care team in advance. Because sedation is typically used, you must have a responsible adult available to drive you home afterward.
Patients are given medication to help them relax and stay comfortable during the procedure. Many patients fall asleep and do not remember much of the exam afterward. The endoscope is gently guided through the mouth, and the procedure does not interfere with your ability to breathe.
You will rest in a recovery area until the sedation wears off, and you may experience temporary bloating or a mild sore throat. While the procedure is generally considered safe, rare risks include bleeding, reactions to sedation, or a tear in the intestinal wall. Some results may be discussed the same day, though biopsy results often take additional time. You should follow all discharge instructions and contact the office if you develop concerning symptoms like fever or severe pain.
