Gastrointestinal refers to the digestive system, particularly stomach and the intestines. It can be further classified into upper gastrointestinal tract and the lower gastrointestinal tract. Stomach, mouth, oesophagus and duodenum are part of the upper gastrointestinal tract while small intestine, large intestine and anus are part of the lower gastrointestinal tract.
A gastrointestinal surgeon (GI surgeon) is a medical professional who has expertise in performing surgery on the stomach, liver, pancreas, oesophagus and intestines. They perform operations on the gastrointestinal tract and can choose from upper gastrointestinal surgery and lower gastrointestinal surgery. However, some GI surgeons operate on both.
Gastrointestinal surgeons can perform gastric bypass surgery, more commonly known as weight-loss surgery. They are qualified to treating various gastrointestinal conditions such as hernia surgery, colorectal cancer, diverticulitis, cancer of the oesophagus, liver cancer, pancreatic cancer, stomach cancer, Crohn’s disease, ulcerative colitis, peptic ulcer, prolapsed rectum, etc.