i think the gastroscope goes further into the stomache,ive had both,,and with the gastroscope i had biopsys and polyps taken from the stomach,with the endoscope i had my upper digestive tract checked ,then i had the colon one which trust me aint nice lol,,,,and the one to check the kidneys ,,omg,,,,so many tubes,,and people think wls is an easy option? ,,,,,,,be"ave! x