Spinal disc herniation is a disease of the spinal cord intervertebral discus. It occurs as a result of the prolapse (herniation) of the gelatinous nucleus of the disc into the intervertebral openings where it presses the root of the spinal nerve, and sometimes centrally, into the spinal canal, the space where the spinal cord is located.
It can occur in any discus, but most commonly at the lumbar and cervical levels of the spinal column.
Lumbar disc herniation is the most common intervertebral disc disease that causes limited mobility and unbearable levels of low back pain that radiates down the leg. It may be accompanied by weakness in the leg muscles and a tingling sensation.