Lumbar Sympathetic Block

A Lumbar Sympathetic Block is a minimally invasive injection procedure designed to reduce pain originating from the nerves of the sympathetic nervous system in the lower back. By delivering medication around the lumbar sympathetic chain—nerves that control pain and blood flow in the legs—this procedure can relieve discomfort associated with conditions such as complex regional pain syndrome (CRPS), vascular insufficiency, or nerve injuries. Many patients experience improved circulation, decreased pain, and greater mobility following treatment.

Quick facts

  • Setting: Outpatient, image-guided
  • Time: ~20–30 minutes
  • Anesthesia: Local with light sedation as needed
  • Recovery: Same-day discharge; mild soreness possible
  • Duration of relief: Varies—may last weeks to months; repeated as needed

Who it helps

  • Complex Regional Pain Syndrome (CRPS, formerly RSD)
  • Peripheral vascular disease or poor leg circulation
  • Phantom limb pain
  • Shingles pain affecting the legs
  • Chronic nerve pain after injury or surgery
  • Hyperhidrosis (excessive sweating) in lower extremities

How it works

The sympathetic nervous system can contribute to chronic pain by maintaining overactive nerve signals or poor blood flow. During a lumbar sympathetic block, your provider injects a small amount of anesthetic medication near the sympathetic nerves along the lower spine under fluoroscopic (X-ray) guidance. This temporarily interrupts abnormal nerve activity and helps the body “reset” normal pain signaling and circulation.

What to expect

  • Before: A review of your medical history and medications; avoid eating or drinking for several hours before the procedure if sedation is used.
  • During: You’ll lie comfortably on your stomach while a local anesthetic numbs the skin. Using X-ray guidance, your provider will place a thin needle near the lumbar sympathetic chain and inject medication.
  • After: You’ll rest briefly for observation and can usually go home within an hour. Mild leg warmth or temporary numbness is common and indicates that the medication reached the target nerves.

Benefits & risks

Benefits:

  • Can provide significant pain relief and improve circulation
  • May help diagnose whether pain is sympathetically mediated
  • Quick, outpatient procedure with minimal recovery time

Risks:

  • Temporary leg weakness, numbness, or tingling
  • Infection or bleeding at the injection site (rare)
  • Low blood pressure or temporary difficulty urinating (rare and transient)

Is it right for me? (Checklist)

  • ✅ Ongoing pain in the legs or feet that has not improved with medication or therapy
  • ✅ Pain that worsens with cold or poor circulation
  • ✅ Diagnosed or suspected Complex Regional Pain Syndrome (CRPS)
  • ✅ Willingness to undergo diagnostic blocks to evaluate response

Alternatives at PCET

FAQs

  • How long does relief last? Pain relief can last from weeks to months; repeat injections may be recommended for sustained benefit.
  • Is this a diagnostic or therapeutic procedure? Both—it can identify whether pain is sympathetically mediated and provide therapeutic relief.
  • What if I feel warmth or flushing in my leg? That’s a normal and positive sign that the block is working.
  • Will I be able to walk afterward? Yes, though mild leg weakness or heaviness may occur briefly.
  • Is it covered by insurance? Most major plans cover lumbar sympathetic blocks when medically indicated.

📞 Call to Schedule

Ready to explore whether a Lumbar Sympathetic Block could help relieve your pain? Call (865) 579-0552 to schedule your appointment today.