Sciatica is the term used to describe pain that follows the path of the Sciatic nerve. Shockwave therapy for sciatica is one treatment approach for helping manage this pain. Pain is often increased by bending forwards and twisting. It is a common misconception that all radicular pain in the lower limbs is classified as Sciatica. The Sciatic nerve is formed by nerve roots from L4 through to S2 which originate in the lower back, and it is the largest nerve in the body; in some people it can be up to 2cm in diameter.