question: Hi. I have had a sharp pain that is located behind my left shoulder blade and sometimes travels down my left arm. It acts up the most when I am sitting at my desk at work and gets worse as the day goes on until I get home to rest. It does not hurt when I am sleeping. I m thinking a pinched nerve. I had this problem 2 years ago. I went to get checked and x-rays showed nothing. It went away after a few months and last year I was fine. Now it s back. Please help