Gastroscopy or upper endoscopy involves examination of the upper gastrointestinal tract, involving the oesophagus (food pipe), stomach and duodenum (first part of the small bowel).If you have symptoms or complaints of nausea, vomiting, heartburn, indigestion, black stools (melaena), weight loss, anaemia, abdominal pain, chest pain then upper endoscopy is considered.

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