Most back pain is uncomplicated and self-limited. If your pain does not get better in a few days or weeks, if you have fever or weight loss, or if you have signs of nerve involvement, you should call your doctor. A medical history and physical examination will allow the doctor to make appropriate treatment recommendations. Imaging (x-rays, magnetic resonance imaging [MRI], or computed tomography [CT]) is not recommended for uncomplicated low back pain. Imaging is used if you have had trauma, evidence of nerve involvement, sometimes for those older than 70 years, or if symptoms are very prolonged. It is also used if your doctor suspects another disease, such as infection or cancer.