A gastroscopy is a type of endoscopy that looks at the inside of the oesophagus, stomach and duodenum. During the procedure you will either be sedated on under a general anaesthetic. Biopsies may be taken of the lining of your oesophagus, stomach or duodenum. If a polyp is found, it may be removed or biopsied. You will need to make an appointment a few weeks after the procedure to discuss the findings and biopsy results (if any were taken).