Why is corticosteroid used in an epidural steroid injection?

A nerve leaving the spine can become irritated by nearby inflammation, a disc problem or narrowing around its path. Inflammation may add to pain, tingling or burning that travels into an arm or leg. The corticosteroid is placed in the epidural space near the suspected source, so the medicine can act locally rather than being taken as a general daily treatment.

The injection is usually one part of a wider plan. It may reduce symptoms enough for walking, sleep, physiotherapy or other treatment to become more manageable, but it does not remove every cause of nerve irritation. A local anaesthetic may be included for temporary numbing. Your response can also give the clinician useful information about the suspected pain source.

Give the clinician a complete list of medicines, especially blood thinners, and mention diabetes, infection, allergies and previous injection reactions. Follow the instructions about eating, transport and activity. Arrange help if your leg or arm feels temporarily weak or numb. Resume exercises gradually according to the plan provided, and record changes in pain, strength and sensation for follow-up.

Contact the treating service promptly for fever, worsening redness or drainage, severe headache that changes with position, or increasing weakness or numbness. Seek emergency help for new loss of bladder or bowel control, numbness around the saddle area, severe breathing trouble or rapidly progressing weakness.

Which nerve or level are you targeting, and what finding supports that choice? What should temporary numbness feel like? When can I restart physiotherapy? Which changes in strength or bladder function require emergency care? What is the next step if symptoms return?