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I began to experience some left shoulder pain which started a few years after I began showing PD syptoms. I had bought my first PC at that time and was using the mouse a lot. My shoulder pain was diagnosed by both a chiropractor and a physiatrist as tendinitis, which it may very well have been, at least in part. I figured it was a repetitive stress injury from over-mousing. It didn't respond very well to treatment, which, I suppose, can happen with tendinitis. Then I began noticing two other things about it. One was that I often felt tension in the shoulder and a tendency to move it up and forward (dystonia?). The other was that my left shoulder seems to be leaner and more muscular than my right. This is quite visible as I look in the mirror and extend my arms straight out to the sides. Currently I experience shoulder tension whenever my PD meds are not working at full steam. Pain can result if I perform certain repetitive motions, in particular, if I try playing the bass part of a ragtime piano piece, which requires continuously having to move my forearm back and forth and up and down. Why did I get the shoulder problem on the left side and not the right? It seems more than a coincidence that my PD first showed itself on my left side. Dystonia must have some of the same results as do repetitive stress injuries. In both cases there is a constant tightening of muscles resulting in reduced blood supply, which, I understand, leads to pain. Phil Tompkins PD -- it's a burden to shoulder. P.S. My S.O. thinks bad puns are a symptom of my condition.