<s>[INST] Hi 37 yr old husband admitted for acute renal failure, presented with severe back pain complaining of pain radiating to abdomen and down to testicles. Kidney function was a 3.5 in 2 days of iv  has dropped only to a 3.2.  ultrasound of abdomen, kidneys, CT, and ultrasound of renal artery all negative no blockage. chest xray noted small non obstructive stone.  Urinalysis no blood or proteinHistory.... Was taking 750mg of motrin each day for back pain (possible cause) and also protein workout supplements otherwise healthy.  Why is function not improving when all tests appear normal and what is causing pain [/INST] Hello. Thanks for writing to us. The back pasin that your husband is having could be related to the renal calculus or may be related to a nerve root compression at the level of spinal cord due to a degenerative disc disease. An MRI scan can help to detect the cause. I hope this information has been both informative and helpful for you. Regards, Dr. Praveen Tayal drtayal72@gmail.com </s>