I have been experiencing a cold sensation from the elbow to the fingertips in my right arm for several days now while sitting at the computer. My rheum. dr. said it was probably a nerve pinching a blood vessel and to try sitting with my shoulders pulled back and exercise that muscle... Well I have been super concsious of how I am sitting today and it is happening anway, the closer to the fingers the colder it is. Anyone else experience this? Am going to PT today for sciatic and low back pain, will mention this to them as well.