What happens at an upper endoscopy?
Last updated September 3, 2026.
Sedated, you lie on your side while a thin flexible camera passes down your throat to view the esophagus, stomach, and upper small intestine - usually well under 30 minutes. The prep is no eating or drinking for up to 8 hours beforehand. A numbing spray prevents gagging, biopsies can be taken painlessly through the scope, and you need a ride home afterward because the sedatives linger.
What to do
- Respect the fasting window. Food or drink inside the window can cancel the procedure.
- Review medications a week ahead. Blood thinners and diabetes medications often need special instructions.
- Arrange the ride home. Sedation rules out driving for the rest of the day.
- Expect a mild sore throat. Normal for a day; severe pain, fever, or vomiting blood is a call-the-doctor sign.
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