For a little while I've felt kind of tight in my lower back on the right side, just where my back meets my ass. It doesn't bother me too much except if I sleep funny or lean to one side for a while for whatever reason.
In addition, since ME Lower day last week I have a ball of soreness on the left side of my back right below my ribcage that I feel if I put any stress on the back there.
What could this be? Is this a problem? How would I remedy it?