A gastroscopy is a test to check inside your throat, food pipe (oesophagus) and stomach, known as the upper part of your digestive system.
It is used to examine the lining of the oesophagus, stomach and duodenum (first part of your upper bowel) and uses a flexible instrument - an endoscope - that is passed through your mouth. The endoscope is about the width of your little finger and has a light and a miniature camera at the tip. Small samples of the lining (biopsies) are sometimes taken through the endoscope.
Click on the headings below to learn more about this procedure: