i went to the dr. and she told me it might be my muscle. I feel like is not, this is how i feel... it only hurts when i sit.no matter what way i sit it hurts really bad it only hurts on the right side of my lower back. only that side the rest of my back is perfect. I don't left anything heavy, but my 24lb 18 old son who's learning how to walk. so i really don't carry him much. i don't know if i should go to the hospital and let the er tell me what it is, my biggist fear is something is wrong and i don't take care of it right away.