How are you? Aside from a kidney stone, flank pain may also be due to other kidney problems such as kidney infection or abscess; spinal arthritis, disk disease or even muscle spasm. Treatment will depend on the underlying cause. For muscle spasm, rest, physical therapy, and exercise may provide relief. However, if it is an infection, antibiotic management may be indicated. If it persists, have this evaluated further for proper management. Direct clinical examination and some tests may help determine the cause.Take care and best regards.