I hurt the right side of my lower back lifting alot of heavy stuff at work about 3yrs ago, and it has been hurting ever since,It hurts when i stand or sit for a long time,somtimes my back fells stiff and its very painfull to walk or sit, i finally went to the doctor last week got x-rays takin got the results and they said there was nothing wrong with my back,it left me confussed, I dont know why it hurts so much