<s>[INST] hello sir ,i have lower back pain on right side since last 2 years . i have used body building supplement (protin powder )after that i have got this pain . i have done many treatments like . kidney stone , urine infection . can u tell me what the matter is . [/INST] Dear patient Considering your history chances of kidney stone is high since you have past history of infection and kidney stone. Single sided back pain is mostly due to renal stone. Also, protein intake increases chances of stone. So I would advise radiograph of lumbosacral spine anteroposterior and lateral which will show radio opaque stone clearly. Ultrasound of abdomen is also advised to confirm position and size of stone.  Please consult expert urologist with report. All the best. </s>