breyet_leyet replied: "First touch the area, if sore to the touch, might be your kidney, low back, side of spine, get to a doctor FAST. Otherwise thru activity or sleep position, your back is out. I go to chiropractors for this kind of pain. When the back is not in alignment, off to the side, twisted, it stretches and twists the Muscle surrounding the back, spine.= spasm. The nerves are in the muscle and they are screaming pain, warning, something not right here, owwww. Putting the spine back, lessens the stretch, twist, muscle spasms, and calms the nerve. Problem after issue is resolved, swelling has to go down. This could take 6-8 weeks maximum to lessen pain, if you get the back adjusted and righted. Then if back was going out all along before reached level of pain, muscle used to holding has been in wrong position, stretched out. Muscle will have to be retrained and strengthened to hold correct position, so generally needs more adjustments, do overs for a while. I went thur this for 15 years, finally off all meds, just use over the counter meds if I can't get to choiropractor. Also, get a good, new bed. You need support there. Sometimes just getting a new bed, puts back in stronger support position, and back can get itself back into position. Although I love after effects of chiro, I feel straight, tall, my nerves are working at maximum capacity, my body rejuvenates when I sleep. Bed is a biggie though, you spend how many hours a day there? ALOT. Do not let some one who is not a chiro adjust you, they will scr*w you up big time. Check and make sure you are not herniated, ask chiro if he has xray machine, mine does, you should be x-rayed before he touches you in case you have some difference, abnormality from birth. Kidney is very big concern though. Check with doctor to be sure, best to treat kidney infection, save kidney, than risk dialysis."