I have got a weird noise happening under my rib on the left side. This is not painful at all, however it sounds a little "grisly" or like a popping in at out...Not like a bone though. I push it in something oops back out...i feel it internally, and also feel the movement on my fingers. When I sit and bend forward I feel it to...like something is rolling back and forth over my rib...help? Should I be worried?