The procedure will depend to some extent on the reason for the endoscopy.

Upper GI Endoscopy:  is the endoscopic examination of the upper gastrointestinal tract from the esophagus to the duodenum.

There are three main reasons for carrying out an endoscopy:

Investigation: Endoscopy is a useful modality for investigating patients suffering from abdominal pain ,vomiting,difficulty in swallowing, unexplained anemia and weight loss, reflux symptoms , to look for stomach ulcers and any bleeding from the gastrointestinal tract.

Confirmation of a diagnosis: Endoscopic biopsies are used for diagnosing malignancies of the gastrointestinal tract

Treatment: An endoscope can treat an illness such as hemoclip application of bleeding vessel or banding of varices