What are Lumbar Sympathetic Blocks
and How Do They Help?

A lumbar sympathetic block targets the sympathetic nerves that are located on both sides of your spine to relieve low back pain. These are the nerves that help control involuntary functions of the body and trigger responses within blood vessels. The lumbar sympathetic block works by blocking these nerves from transmitting pain signals to the brain.

If you are suffering from low back pain, take the first step to finding relief from your pain with our free interactive assessment. 

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Do I Need A Lumbar Sympathetic Block?

Common Symptoms of Sciatica

The injection targets the affected area of the spine in a way that’s more direct than what can be achieved with medication and many other common non-surgical remedies

A lumbar sympathetic block targets the sympathetic nerves that are located on both sides of your spine. These are the nerves that help control involuntary functions of the body and trigger responses within blood vessels. The injection works by preventing (“blocking”) these nerves from transmitting pain signals to the brain. Lumbar sympathetic blocks are sometimes performed for diagnostic purposes, especially if the source of lower back or radiating nerve pain cannot be clearly determined.

A lumbar sympathetic block may be recommended if you have lower back pain that’s not sufficiently managed with other pain management techniques. Injections may also be recommended to ease discomfort experienced in buttocks, thighs, or legs, as is common if the sciatic nerve is affected. The longest single nerve in the body and a common source of radiating pain, the sciatic nerve originates in the lower back and extends to the legs. Lumbar sympathetic blocks may also ease pain from:

  • Peripheral neuropathy
  • Reflex sympathetic dystrophy, a rare disorder affecting the sympathetic nervous system
  • Vascular insufficiency
  • Herpes zoster (“shingles”) infections affecting the legs
Common Causes of Lumbar Sympathetic Nerve Pain

Lumbar sympathetic blocks are primarily used to treat disorders or injuries sustained in the sympathetic nervous system. Irritation or trauma to the sympathetic nerves can result in Complex Regional Pain Syndrome (also called Reflex Sympathetic Dystrophy). The most common causes of lumbar sympathetic nerve pain that results in needing lumbar sympathetic blocks include: 

  • Injury to soft tissues of an extremity
  • Vascular disease
  • Ischemia of the lower limbs
  • Phantom limb pain


The source of your pain is a determining factor in your candidacy for this pain management treatment. 

If you are suffering from sympathetic nerve-related pain, Integrated Spine Institute can help you find relief. Find out if lumbar sympathetic blocks are a treatment option for your pain below.

Am I A Candidate for Lumbar Sympathetic Block?

What to Expect with Lumbar Sympathetic Blocks

You will be laying on an x-ray table on your stomach during the procedure. You will be given a local anesthetic that will numb the immediate area. If the block is being done for therapeutic purposes, a steroid medication is typically included in the injection. Such medication can reduce any swelling, or inflammation, that may be placing additional pressure on the sympathetic nerves.

Under the guidance of special live X-ray, the doctor will direct the needle to the correct location around the sympathetic nerves in your lower back. A dye is usually injected to confirm that the medication used in the nerve block is reaching the correct spot.

How Do Lumbar Sympathetic Blocks Help?

You may experience immediate relief due to the numbing effects of the anesthesia. It may take a week or two before the full effects of the steroid medication are noticed. The entire procedure can usually be completed in under 30 minutes. You may be observed for a short period after receiving a lumbar sympathetic block, although you will be able to go home the same day since it’s an outpatient procedure.

While the anesthetic is still working, you may feel some temporary warmth or other sensations after receiving a lumbar sympathetic block. Complication risks are low. Avoid strenuous activities for a day before returning to your normal routine. Lumbar sympathetic blocks do not usually affect other medications you may be taking for other conditions. Your doctor will provide any other instructions specific to your situation.

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