Sciatica is a common condition arising from compression of, or damage to, a nerve or nerve root.
Sciatica is usually caused by the degeneration of an intervertebral disc, which protrudes laterally to compress a lower lumbar or an upper sacral spinal nerve root. The onset of sciatica can be sudden, e.g. following an awkward lifting or twisting movement.
Sciatica can involve:
- pain felt down the back and outer side of the thigh, leg, and foot
- the back being stiff and painful
- numbness and weakness in the leg
See also diseases and disorders of the nervous system (all on one page).