Well i use to study electric guitar 3-4 hours a day..but i seperate that period of time in 4 pieces of 1 hour!3 days ago i felt something like pain in my left hand..at the upper side of....and stopped playing!For one day i completly get rest..i did not play guitar...But istill feel a very very very little pain..ache or something..anyway something bothers me..What is it?Is it tendonitis?How can i prevent tentonitis?Is there something i can do?Thanks alot!