This is a special x-ray that is used to view moving body structures as the patient swallows a contrast material (barium). It is used to examine the oesophagus, stomach and duodenum to detect abnormalities including ulcers, blockages, tumors, inflammation, reflux or hernias. It may be used to help diagnose severe indigestion, trouble swallowing, blood in stool, abdominal pain, unexplained vomiting etc.