Why is corticosteroid used in a nerve root block?

A nerve root can become irritated where it leaves the spine. Nearby swelling may contribute to sharp, burning or electric pain that travels into an arm or leg, along with tingling or altered sensation. The corticosteroid is delivered close to the selected nerve root so it can calm local inflammation. A local anaesthetic is often used for temporary numbing and can help the clinician compare your symptoms before and after targeting that nerve.

This procedure may have both a treatment and an assessment role. Reduced pain can support sleep, walking and physiotherapy, while the pattern of relief may help confirm whether the selected nerve contributes to symptoms. It does not repair every disc or narrowing problem, and other care may still be needed.

Tell your clinician about blood thinners, diabetes, infection, allergies and previous reactions. Follow directions about transport and activity, and do not rely on a temporarily numb limb for strenuous tasks. Keep a simple record of pain, strength and sensation after the procedure. Use the rehabilitation plan provided and report changes at the arranged review.

Contact the treating service promptly if weakness or numbness is increasing, or if you develop fever, worsening injection-site redness, drainage or a severe positional headache. Seek emergency help for new bladder or bowel control loss, saddle-area numbness, severe breathing difficulty or rapidly progressing weakness.

Which nerve root will you target, and why? What symptoms could be expected from the local anaesthetic? How should I protect a numb arm or leg? Which changes require emergency care? What is the plan if the block gives only brief relief?