Radicular pain refers to pain that comes from nerve root irritation. Nerve roots is the part of the neck anatomy where the nerves exit the spinal column and start their travel down to the arms. Inflammation of these nerve roots may cause pain in these regions due to irritation from a damaged disc or from contract with the bony structure of the spine in some way. A cervical epidural injection places anti-inflammatory medicine into the epidural space to decrease inflammation of the nerve roots, reducing the pain in the neck, shoulders and arms. The injection helps the injury to heal by reducing inflammation.