Sciatica is a type of pain caused by compression or irritation of the sciatic nerve. A prolapsed disc in the back is a most common cause.
The sciatic nerve is the longest nerve in the body, going from the pelvis, through the buttocks, down the legs to the feet.Having a prolapsed disc (also known as a slipped disc) in the back is a most common cause of sciatica, but sometimes doctors do not find an obvious cause of the pain.
