Not sure what I did, but somewhere in the past three or four days, I pulled or strained something in my lower back. It's not bad if I stand and walk around, but sitting for any length of time (in any kind of chair) makes it stiffen up, so that when I stand back up it's difficult to straighten all the way for the first few moments. After walking for a bit, it loosens, but I can still feel the tightness and some residual pain. The problem seems to be centered just where my back transitions to my bottom.
I've used heating pads (that helps a bit) and Aleve (that helps a bit more). Right now, I'm trying a spray-on analgesic and a lumbar pad in my desk chair. They seem to be helping some as well.
Anybody got some suggestions as to what the problem is and a solution?