nah, dont think most people have it.
mines from loud music. excessively loud. and a lot of it.
hasnt always been there. ive noticed it more in the past two or so years.
most people may just be hearing random frequencies from some source somewhere, ie: tv, computer, cell phone charger. but as soon as they pop in some ear plugs its gone.
i just hope to hell it doesnt get as bad as some of you guys, would drive me nuts.