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    There's good support in the medical literature that epidural steroids can help herniated discs and should always be considered before surgery.  Here are a few studies:

    Transforaminal or selective nerve root blocks help HNP in this outcome study...
    Steroids supress scar tissue formation around the nerve roots...
    ESI versus surgery, a one year follow-up...
    No difference long term between ESI and no injection with regard to back surgery rate...