Endoscopy

Endoscopy is one of the most common diagnostic procedures in gastroenterology, allowing a specialist to directly examine the digestive tract using a thin, flexible tube with a camera — rather than relying on symptoms and imaging alone to guess at what's causing a problem. It's often the deciding step that turns uncertainty into an actual diagnosis.

What endoscopy can actually see and do

Beyond simply viewing the digestive tract, endoscopy allows doctors to take tissue biopsies, remove small polyps, stop active bleeding, and in some cases treat the very problem being investigated in the same session — meaning it's frequently both diagnostic and therapeutic at once.

Types of endoscopic procedures

1. Upper endoscopy (gastroscopy): examines the esophagus, stomach, and the first part of the small intestine — used for symptoms like persistent heartburn, difficulty swallowing, or unexplained abdominal pain
2. Colonoscopy: examines the large intestine and rectum, commonly used for colorectal cancer screening as well as investigating changes in bowel habits or blood in stool
3. Capsule endoscopy: a swallowable capsule with a small camera photographs the small intestine as it passes through — useful for areas standard endoscopes can't easily reach

What to expect on the day

Most endoscopic procedures are done under sedation, meaning you're relaxed and typically don't remember much of the procedure itself. Upper endoscopy generally takes 10–20 minutes; colonoscopy usually takes 20–40 minutes. Because sedation affects reaction time and judgment for several hours afterward, you'll need someone to drive you home and shouldn't plan to return to work the same day.

Preparing properly matters

Preparation differs significantly by procedure type:

1. Upper endoscopy typically requires fasting for six to eight hours beforehand
2. Colonoscopy requires a more involved bowel preparation the day before, including a specific diet and a prescribed cleansing solution — this step genuinely determines how clearly the doctor can see the colon, so following it precisely matters more than patients often realize

Understanding the results

If a biopsy is taken during the procedure, results typically take several days to a week to come back from the lab. Your gastroenterologist will schedule a follow-up to discuss findings and next steps, whether that's reassurance, medication, or further treatment planning based on what was found.

When to consider getting one

Persistent digestive symptoms — recurring abdominal pain, ongoing reflux, unexplained changes in bowel habits, or blood in stool — are generally worth an endoscopic evaluation rather than continued guesswork with over-the-counter remedies. Our gastroenterology specialists can assess your specific symptoms and determine which type of procedure, if any, is the right next step.