Gastroscopy also known as an upper endoscopy, is a procedure where a thin tube with a camera (endoscope) is inserted through the mouth to view the upper digestive system. This is the go-to method for doctors to diagnose and sometimes treat conditions affecting the oesophagus, stomach, and beginning of the small intestine.

It is an useful scope for spotting ulcers, tumours, cancer, inflammation, polyps, abnormal tissues or cells.