Low back pain is a common musculoskeletal disorders affecting 80% of people at some point in their life. It accounts for more sick leave and disability than any other medical condition.It can be either acute, subacute or chronic in duration. Most often, the symptoms of low back pain show significant improvement within a few weeks from onset with conservative measures.The causes of lower back pain are varied. A traumatic event may result in either muscular pain or a vertebral fractures. At the lowest end of the spine, some patients may have tailbone pain . Others may have pain from their sacroiliac joint, where the spinal column attaches to the pelvis, called sacroiliac joint dysfunction. Physical causes may include osteoarthritis, rheumatoid arthritis, degeneration of the discs between the vertebrae or a spinal disc herniation, a vertebral fracture, or rarely, an infection or tumor.