How do epidural steroid injections (ESI) treat pain?

Epidural steroid injections (ESI) are injections into the spinal canal that are intended to reduce the swelling or inflammation of the surrounding tissues that cause nerve pain. The research reviews for this procedure offer mixed opinions. The treatment is not recommended for herniated discs, but in some cases of spinal stenosis and joint irritation, ESI is helpful in reducing inflammation and relieving symptoms for extended periods.

Because canal narrowing is permanent, irritation can return, and the procedure may need to be repeated. ESI is usually administered as a series of three injections over a six-week period. If the first injection does not provide a modest reduction in symptoms, the treatments will probably be unsuccessful, and there is no need to undergo any additional injections.

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