Numbness and tingling in my left arm

I am a 56 year old male with a history of high blood pressure. It is currently being succesfully treated with meds. I am a professional driver and sit for long periods. I latley have experienced tingling and numbness in my left arm hand and fingers. I am not excessivly overweight and consider myself to be somewhat inactive. Is this signs of heart troubles, nerve troubles or some other broblem.