An epidural steroid injection (ESI) is a common way to treat inflammation associated with back pain, as well as related pain in the neck, legs, or arms. Spinal nerves may become inflamed due to narrowing of the passages where nerves travel as they pass down or out of the spine. An epidural procedure delivers powerful anti-inflammatory medicine directly into the space outside the spinal sac of fluid around the spinal cord. This area is called the epidural space. An ESI is not the same as epidural anesthesia given just before childbirth or certain types of surgery.
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