I have, what I believe to be a tendon in my left arm that is, and has been, "pulsating"continuously now for 2-3 months..it is confined mostly to my forearm, appearing to stop at the elbow or "elbow to wrist"...no pain at all..my ared to doctor, gp, thinks it is probably a tendon also but didn't know what was causing it or if it is a tendon for certain..compared to my normal pulse in that arm... the pulsating has a totally different rhythm to it.. I don't know if I should see an Orthopedic doctor or a neurologist to learn the cause ??? Ken Bishop