An epidural steroid injection (ESI) is the delivery of powerful anti-inflammatory medicine directly into the space outside of the sac of fluid around your spinal cord. This area is called the epidural| medlineplus.gov
Low back pain refers to pain that you feel in your lower back. You may also have back stiffness, decreased movement of the lower back, and difficulty standing straight.| medlineplus.gov
Spinal cord trauma is damage to the spinal cord. It may result from direct injury to the cord itself or indirectly from disease of the nearby bones, tissues, or blood vessels.| medlineplus.gov
A herniated or slipped disc means that one of the soft cushions or discs between your vertebrae or spinal bones pushes out. Find out about it here.| medlineplus.gov
Opiates or opioids are drugs used to treat pain. Opiates are derived from plants and opioids are synthetic drugs that have the same actions as opiates. The term narcotic refers to either type of drug.| medlineplus.gov