question: My thumb, and the top of my left hand from from my lower thumb to my wrist and extending slightly up my wrileft arm-appropimately 5-6 inches hurts. It just started hurting yesterday. I am left handed. I can t recall anything I did to have cause any injury. A vein that runs along that area seems a bit swollen. When I attempt to use my hand for even the simplist thing, it hurts and is also tender to the touch. Any idea what might be causing this? Dona from Va.