Nerve pain. There are a few common causes of lumbar radiculopathy. It is pain coming from a pinched nerve. The nerves are most often pinched by discs, bony spurs, or overgrown ligaments. Rarely, the nerves can be compressed by tumors or infection.
See below. Nerve irritation caused by damage to the discs between the vertebrae. Damage to the disc occurs because of degeneration ("wear and tear") of the outer ring of the disc, traumatic injury, or both.