The pain originated left of center in the back of my neck.The next day my neck and shoulder were stiff and sore. The pain seemed to originate from a different place, the trigger point @ the edge of my left shoulder blade.The prevention of movement didn't occur untill about a week later. I can raise my hand to the height of my head. If I push my arm up with my other hand by pushing up from under my elbow, my arm will raise. There is no pain when I do this. It seems as if my arm is dead weight when I do this. I can use it in every other capacity when it is not raised, although it is slightly weak. I am right handed, if that has any bearing.