Here are my stats in case there is some common link that could be causing it.
53, excellent health
, have enlarge prostate (take Flomax). Also take Centrum Silver, Zocor, Nexium and a baby aspirin. But, have taken all these for a long, long time and doubt any of them are the cause. I started a new job where I sit in an office chair 8 hours+ each day. The vibration started a few days after I started this job, though I've had office type jobs my entire life.