Sciatica is leg pain caused by a pinched nerve in the lower back. Although the pangs begin in nerve roots located on either side of the lower spine, they then course through the sciatic nerve, which runs the length of each leg from the buttock down to the foot.
Pain in the lumbar region, radiating down to the hips and legs are caused by dysfunction of the sciatic nerve. This condition is called sciatica and is not a disease, but rather a symptom of a disease of the sciatic nerve. This is common among people over 40 years.