question: My lower back hurts slightly when i stand and some times when i sit.  When i sit down and stand up i sometimes, but not always feel a bone move in my lower back. It feels/sounds  like a pop. It is not a crack. It does not hurt when it pops in and out when i kick my right leg out, but when i stand and it some time pops it does hurt. It does not happen when i kick my left leg. I have this problem for a few weeks now. I have no problems at all when i lay down to go to sleep. No other part of my body hurts just my lower back. Whats wrong with me?