Gastrointestinal endoscopy is a procedure that enables viewing of the lining of the gastrointestinal (digestive) tract. The examination is performed using an endoscope, a flexible fibreoptic tube with a camera at the tip that transmits images to an eyepiece or display screen. The endoscope is commonly inserted through the mouth and down the oesophagus. The procedure facilitates diagnosis of gastrointestinal (GI) disease as well as treatment. GI endoscopy may be performed on either an outpatient or inpatient basis; the patient is usually given a sedative. Other GI endoscopy includes colonoscopy (examination of the colon or large bowel / large intestine), which starts at the end of the small intestine and ends at the rectum and anus. Enteroscopy allows examination of the small intestine.