Lumbar Sympathetic Block


This procedure is an injection that numbs branches
of nerves in your lower back. It helps doctors find
and treat a number of problems linked to these
nerves. Usually, a series of injections is needed to
treat a problem.

About the Sympathetic Nerves

The sympathetic nerves travel along both sides of
your spine. They are associated with a wide range
of functions that you don’t consciously control.
These include your circulation, digestion and sweat


In preparation for the procedure, you lie on your stomach or your side. You are given medicine to make you feel relaxed. The skin and tissue at the injection site is numbed.

Inserting the Needle

The physician inserts a needle and carefully guides it to the sympathetic nerves. The physician typically uses an x-ray device called a “fluoroscope”. This shows a video image of the needle’s position. Contrast dye may be injected to help confirm that the needle is placed correctly.

Injecting the Medicine

Next, the physician injects medicine. It bathes the nerves. It can numb the nerves and reduce inflammation. If these nerves have been a source of pain, the medicine can relieve it. The injection may also provide other benefits, depending on your needs.

End of Procedure

When the procedure is complete, the needle is removed and the injection site is covered with a bandage. You will be monitored for a brief time before you are allowed to go home. After a lumbar sympathetic block, many people experience leg numbness or weakness. This is normal, and usually lasts for only a few hours. You may need to return for more injections in the future.