Had tendonitis in my left wrist from drumming. I've also got sleep apnea (or however you spell it), and I've had injuries from Taekwondo that were of varying degrees of severity. Pretty much anything from bruises on my forearms that never get the chance to heal, to bruised bones and soft tissue damage around joints. Thankfully I'm healthy at the moment, aside from the sizeable gash on the back of my hand. For anyone in any martial art, do everyone else a favor and cut your toe nails before sparring.