Ive been having this problem for quite a while now.
Basically it started with pain in my shoulder, and i thought it was rotator cuff problems, but then i started to notice the pain in my hand, and bicep as well.
Im pretty sure it is Thoracic outlet syndrome, and is a result of a trigger point on my trapezius, right on top of the medial part of my scapula.
The pain/numbness comes and goes, but i have found that when its "flaring up" if i push on that trigger point and massage it, the pain tends to go away temporarily.
I have seen a physical therapist for this, and he wasn't possative what it was, but just told me to massage that spot anytime it hurt.
He did say it may be a result from poor posture when sitting, but ive been working on that.
Ive been working on posture and flexibility, doing broomstick rotations. Anyone have any experience with this, or what might help with it?