And in addition, it could be an indication of kidney problems, disk degeneration, or any nuraber of other physiological problems. Have you seen a doctor yet? If not, and this has lasted more than a week or two, start with your family doctor. He can do a basic exam and x-rays, then either refer you on or order more intensive tests if necessary.
I'm not trying to scare you. Without more information, it's hard to give you good advice. Low back pain can be caused by soooo many things, some serious and some minor. Let's hope that yours is minor and you'll be back to normal soon!
Blessings,
Emily