Gastroscopy is an examination of the inside of the oesophagus (throat), stomach and duodenum (the first section of small intestine). It is performed by using a thin, flexible fibre-optic instrument (gastroscope) that is passed through the mouth to check for any damage to the lining of the oesophagus or stomach, and for any ulcers in the stomach or duodenum. The procedure is painless and is usually done under a sedative.

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