Definition of Sciatica:

Sciatica refers to pain, weakness, numbness, or tingling in the leg. It is caused by injury to or pressure on the sciatic nerve. Sciatica is a symptom of another medical problem, not a medical condition on its own.

Causes, incidence, and risk factors:

Sciatica occurs when there is pressure or damage to the sciatic nerve. This nerve starts in the lower spine and runs down the back of each leg. This nerve controls the muscles of the back of the knee and lower leg and provides sensation to the back of the thigh, part of the lower leg, and the sole of the foot.

Common causes of sciatica include:

• Slipped disk
• Piriformis syndrome (a pain disorder involving the narrow muscle in the buttocks)
• Pelvic injury or fracture
• Tumors