During a gastroscopy, the esophagus, stomach and duodenum are examined. Diseases of these organs can be detected (e.g. inflammations, ulcers, varicose veins, polyps or tumors) and in some cases treated, or the course of known diseases can be monitored.


An infusion is first placed in the arm to administer any sleeping and sedative medication. If you wish, this can also be dispensed with and only a local anesthetic spray can be applied to the throat. The examination is carried out using a thin, movable “tube” with a light source and a camera attached to its tip. This allows the doctor to inspect the mucous membrane of the organs mentioned and look for pathological changes. In addition to a detailed inspection of the mucous membrane, tissue samples can be taken or various procedures performed, such as hemostasis or tissue removal. The examination and the additional procedures do not cause any pain. During the examination, a specially trained nurse (nurse or practice assistant) is present in addition to the doctor.


Please do not eat any solid food from midnight before the gastroscopy, as the upper digestive tract must be free of food residues for the gastroscopy. Drinking clear, fat-free liquids (no milk) is permitted up to two hours before admission, until then you can also take your regular medication with a little water.


After local anesthesia of the throat with a spray, you must not eat or drink anything for at least one hour. If you experience abdominal pain or other symptoms (e.g. dizziness, nausea, vomiting) after the gastroscopy or if blood comes out of the anus (usually in the form of black, runny stools), inform your doctor immediately or go to an emergency ward.

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University Hospital Zurich
Department of Gastroenterology and Hepatology
Rämistrasse 100
8091 Zurich

Tel. +41 44 255 85 48
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