What Causes Numbness And Tingling On Fingers Radiating To Elbow?

I started experiencing numbness and tingling in my left pinky and ring finger 3 weeks ago. It has now progressed up my arm to my elbow, effecting my elbow, forearm, ring and pinky finger. Is it just a pinched nerve or a more serious problem? I am 35 yrs old, 5'7", 170 lbs. I was diagnosed with hypertension 4 years ago.