The intervertebral discs are located throughout the entire length of the spine in between each of the vertebrae (bones of the spine). A disc Herniation occurs when the jelly-like substance from within the disc protrudes out the back and side of the spinal column. It is theorized that the protruded herniated disc material caused the release of irritating substances or initiated an autoimmune inflammatory reaction. This disc, the corresponding inflamed nerve root, or compression of the nerve root by the disc may be the source of pain. This can cause any of the following symptoms; low back pain, tingling, pain and weakness down the affected limb (usually below the knee). The pain is often of sudden onset from a bending and/or twisting manoeuvre but is the result of cumulative repetitive trauma. There is often a past history of several bouts of low back pain that have resolved. The disc can become dysfunctional due to cumulative trauma (ie: repetitive combined movements of flexion of the back and rotation), the effects of aging, or degenerative disorders of the spine. Most people with back pain however, do not have pain from herniated discs. Current research using an MRI had shown that as many as one third to one half of healthy asymptomatic young men have signs of disc bulge or Herniation.