Pain in lower right back?

forgot to add it goes to the groin as well (the groin isn't so bad but its the right lower back that really aggravates)
Update: ive been having this pain for over a month,had x-rays done,blood work,had a cat scan (back on july 26th),they found nothing except 2 kidney stones..not sure what the heck is going on and it seems no doctors can help me out
Update 2: as far as i know i haven't passed them and i have a uroligist which i cant see till february..i told him about my back pain a couple of weeks ago and he told me you shouldn't be feeling any pain when the stones are in the kidney,yet ive heard many people say they do have discomfort when they sit in there
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