I did a month of GI during my rotations and they were long hours. Ton's of scoping, both EGD and Colonoscopies. Then you put in G-tubes, ERCP, pericentesis. A ton of procedures...don't forget the all-powerful rectal exams. They also got a lot of consults on the floor. All the GI bleeders, pancreatitis, cirrhosis, hepatitis. Its like everyone gets a GI consult. Best advice is to do your IM at a hospital with a GI fellowship, tell them you're interested in the field, work your butt off during IM and so when you apply they'll be impressed. I originally wanted to go into GI but I can't stand 4 years of IM. Its way too "academic", too many lectures, discussions on journals, blah blah blah, with very little quick results. You basically treat chronically ill patients who are all old and have a zillion medical conditions that take 20 medications and all you can do is treat their symptoms and send them home until they come again. How depressing. But the subspecialties are nice. Like the above poster said...a ton of procedures means a ton of money.....insurance companies pay a lot for procedures and little for thinking.