Welcome to this board, Painguy and don't be a stranger as your insight will be appreciated by many. I DO understand what you do and are referring to, as I would get occasional sharp pains in my chest in my late 20's (scary) that after many tests was found to be from old football injury in lower back. I think they called it referral pain. THAT same injury has me now with chronic back pain as predicted by then physician at that time. (no more chest pain, thank God, LOL) I am now getting relief of that back pain from the Actipatch. Took pain killers for years but told to get off them by MD's.