Upper endoscopy

During an upper endoscopy, you lie down and the doctor puts a thin tube with a camera and light on the end (called an endoscope) into your mouth and down into your esophagus, stomach, and duodenum (the first part of your small intestine). The camera sends pictures from inside your body to a television screen. That way, your doctor can see the inside of your esophagus, stomach, and duodenum.