I wouldn't consider myself a MMA "fighter", no UFC/competition aspirations here
The only injury I have done to myself, outside of the occasional bleeding nose, bruise or velcro burns, is injure a rib, not let it heal properly and now the pain has become somewhat chronic.
Strains, sprains, and various torn material. I've broken fingers and a clavicle on the ground. Small bones in the hand from punching. I did both of my wrists falling. Took a side kick to the ribs that broke a few as a teen. Smashed my nose a few times and smashed my toes. When I competed, I spent more time injured then healthy...and I think that is the norm.