There can be different causes for this, and don't know if mine is the same, but I have neuropathy in the hands, legs, feet for years since chemo, and limited arm/ shoulder mobility from my neck dissections that followed. More recently, my left arm/hand have increased numbness, pins and needles, barely any mobility, and pain/numbness in the deltoids, upper chest on the left side, which I haven't had before. My Oncologist referred me to a neurologist, and physical therapy when it was only slight, and my ENT requested an MRI to rule out any recurrence, which came back clear. My surgeon is thinking "Brachial Plexopathy." I think removal of my carotid may being involved too, and is when some of my recent symptoms started. I haven't seen the neurologist yet, but that's where I stand, so not much of an answer myself. I needed something for the pain, and Percocet, Gabapentin and an anti-inflammatory cream, Voltaren, is helping.
http://en.m.wikipedia.org/wiki/ParesthesiaGood luck.
