Iatrogenic
Failed back syndrome is a syndrome of chronic back pain after surgery that was intended to treat back pain caused by different reasons, but did not succeeded in bringing about any improvement.67It can be caused by disc remnants, recurrent disc herniation, damage to nerves during surgery, operation on the wrong segment, spinal stenosis or instability, epidural fibrosis, arachnoiditis, and infection. The clinical picture depends upon etiology.67 Several medications can cause back pain, for example: statins, bisphosphonates (especially resindronate), aromatase inhibitors, isoretinoin and carvedilol.68