I also have been experiencing a lower left abdominal vibration, no pain. Started on July 18th. I had been painting and scraping the garage, on a ladder. thought maybe this triggered something. It went on, off and on for 2 weeks. We went to visit our son and NYC. Put on 45 miles walking. no problem. Came home. Off and on vibration started again, then stopped completely for ;7 days. Now back again. I am 64, weight about 148, take advair for asthma. The vibration is annoying and scary because I don t know what is causing it and hoped after it had stopped for 7 days that it would go away on its own.