Low back pain is common and is usually due to strain on bones, muscles, and ligaments (that is, musculoskeletal). Musculoskeletal low back pain can hurt a lot but usually goes away after a few days to a month. Sometimes, medications and exercises are helpful. Studies have shown that radiology tests (x-ray, computed tomography, or magnetic resonance imaging) are beneficial only if the pain worsens despite initial care or if patients have signs of nerve damage or a serious medical condition. Such signs include weight loss, fever, abnormal reflexes, or loss of muscle power or sensation in the legs. Although most patients with low back pain do not need radiology tests, many patients get them.