Pain that travels from the neck into the arm, or from the lower back down the leg, is often a sign of an irritated spinal nerve. When tablets, rest and exercise do not give enough relief, doctors may suggest a transforaminal epidural injection for disc problems in neck and back. This article explains what the procedure is, how it is done and what patients can expect. How a Disc Problem Leads to Nerve Pain The spine is made of bones separated by soft, cushion-like discs. With