I've had this for about a year or more.  On a scale of one to ten (ten being the worst) it's about a 4.  It's not constant, I feel it only when I move sometimes, it doesn't hurt if I put pressure on it or touch it or anything like that.  I had a CT scan of my abdomen one year ago and they didn't find anything that would cause this.  I really don't feel like going back for more tests...