Gastroenterologists treat diseases of the gastrointestinal tract (also known as the gut or digestive tract).
This includes the oesophagus (or gullet), stomach, small intestine and large intestine. It also includes the hepatobiliary tree (comprising the gallbladder, bile ducts and pancreas).
The entire gastrointestinal tract is about 10 metres in length and is responsible for breaking down food and absorbing nutrients so that it can be delivered to the rest of the body.
Problems occur when the there is an abnormality in the structure or the function of the gut. Common symptoms include difficulty swallowing, acid reflux, abdominal pain and a change in bowel habit.