How does nerve root block work?

The clinician uses imaging to guide a fine needle to the selected nerve root, usually near the point where it leaves the spine. Local Anaesthetic can numb signals for a short period, while Corticosteroid may calm inflammation around the nerve over the following days. Relief can support movement and rehabilitation, and the response may help the clinician judge whether that nerve contributes to symptoms. The injection does not remove a disc problem or widen the spinal canal, and benefit varies with the cause of irritation.

Tell the team about medicines, allergies, diabetes, infection, pregnancy, and previous reactions to injections. Arrange transport if advised and follow instructions about eating, medication, and activity. Mild soreness or temporary heaviness can occur; avoid strenuous activity until you have been told it is appropriate. Record changes in pain, sensation, and strength, including how long any relief lasts. Sciatica may be one reason a targeted block is considered.

Get prompt medical advice for fever, spreading redness, drainage, severe headache, persistent numbness, or worsening weakness after the injection. Seek urgent care for new bladder or bowel difficulty, numbness around the genitals, breathing trouble, or a rapidly worsening reaction. These symptoms need assessment rather than waiting for the injection to take effect.

Ask which nerve is being targeted, whether the injection is mainly diagnostic or therapeutic, what medicine will be used, when benefit should be judged, and which symptoms require urgent contact.