Injury or damage to peripheral nerves can result in neuralgia, neuritis, and certain neuropathic pain "states" implying that pain is emanating from damaged nerves that are sending inappropriate pain impulses in the absence of an underlying tissue injury. Identification of a damaged peripheral nerve as the source for ongoing pain is possible using nerve block techniques. A nerve root block is an injection placed into the sheath surrounding a nerve root in the spine. The exam uses therapeutic steroid and local anesthetic to decrease pain and inflammation. Pain relief from the procedure varies from minimal to long-term, depending on the specific symptoms.