• 30 Oct, 2026
• UnityPain
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Lumbar Sympathetic Block | Unity Pain Clinic Modesto

When Back and Leg Pain Won’t Let You Rest

Living with deep, burning pain in your lower back or legs can feel exhausting and discouraging. Maybe you’ve tried medications, physical therapy, or other treatments — and nothing has given you lasting relief. If that sounds familiar, you are not alone. Many people suffer from a type of pain that comes from the nervous system itself, not just from muscles or joints. A lumbar sympathetic block may be one option worth learning about. Understanding how it works can help you have a better conversation with your care team.

This article explains what a lumbar sympathetic block is, who might benefit from it, and what to expect if you are considering this type of procedure. As always, a qualified medical provider should evaluate your specific situation before any treatment decision is made.

What Is the Sympathetic Nervous System?

Your nervous system has two main parts. One part controls things you choose to do, like moving your arm. The other part — called the autonomic nervous system — controls things your body does automatically, like your heart rate, blood flow, and sweat. The sympathetic nervous system is a division of that automatic system. It plays a big role in your body’s “fight or flight” response.

The sympathetic nerves that serve your lower body run along the front of your lumbar spine, which is your lower back. Sometimes these nerves become overactive or start sending pain signals even when there is no ongoing injury. This is called sympathetically maintained pain. It can cause burning, aching, or throbbing sensations in the legs, feet, or lower back that can be very hard to treat with standard pain medicines alone.

What Is a Lumbar Sympathetic Block?

A lumbar sympathetic block is a procedure where a doctor injects a local anesthetic — a numbing medicine — near the sympathetic nerve chain in the lower back. The goal is to interrupt the pain signals those nerves are sending. By temporarily “turning off” those overactive nerve signals, the procedure may reduce pain and improve blood flow to the legs and feet.

The injection is done using image guidance, usually fluoroscopy (a type of live X-ray) or CT scan. This helps the doctor place the needle very precisely near the correct nerves without harming surrounding tissue. The procedure is typically done in a clinical or procedural setting and does not require a hospital stay. A steroid medication is sometimes added to the injection to help reduce inflammation around the nerves.

Who May Benefit From This Procedure?

Lumbar sympathetic blocks are most often considered for people with certain types of pain conditions. These include:

• Complex Regional Pain Syndrome (CRPS) — a condition that causes severe burning pain, often after an injury, along with skin color or temperature changes in the affected limb
• Peripheral vascular disease — reduced blood flow to the legs that causes pain, especially with walking
• Phantom limb pain — pain that feels like it is coming from a limb that has been amputated
• Sympathetically maintained pain — pain driven by abnormal activity in the sympathetic nerves
• Hyperhidrosis — excessive sweating of the lower limbs

Not everyone with leg or back pain is a candidate for this procedure. Your provider will carefully review your medical history, symptoms, and previous treatments. A thorough evaluation is essential before considering any nerve block procedure. If you are unsure whether this might help you, speaking with a pain specialist is a good first step.

What Happens During and After the Procedure?

Before the procedure, your doctor will explain the risks and benefits and answer your questions. You will likely be asked about any blood thinners or medications you take. On the day of the procedure, you will lie face down on a table. The skin over your lower back will be cleaned and numbed. Using image guidance, the doctor carefully advances a thin needle to the target area near the lumbar sympathetic nerve chain and injects the medication.

The procedure itself usually takes less than 30 minutes. Some people feel warmth or heaviness in their legs right after, which can be a sign that the sympathetic nerves have been reached. You will be monitored for a short time afterward and then allowed to go home with a driver. Most people can return to light activity the next day, though your provider will give you specific instructions. Some people notice pain relief quickly, while for others it may take a day or two to feel the full effect.

Are There Risks to Know About?

Like any medical procedure, a lumbar sympathetic block carries some risks. Most are rare when the procedure is done by an experienced provider using image guidance. Possible risks include:

• Temporary soreness or bruising at the injection site
• Temporary low blood pressure or dizziness right after the injection
• Infection (rare)
• Bleeding (rare)
• Nerve injury (very rare)

Your doctor will discuss these risks with you and help you decide whether the potential benefits outweigh them for your specific situation. It is important to tell your provider about all medications, allergies, and health conditions before scheduling any procedure.

Finding Support for Your Pain Journey

Chronic pain is not just a physical experience — it affects your sleep, your mood, your relationships, and your quality of life. If you have been struggling with burning leg pain, lower extremity symptoms, or other types of persistent pain, there is help available. You deserve a care team that truly listens and works with you to find the right approach.

At Unity Pain Management in Modesto, CA, a compassionate team is ready to evaluate your pain and discuss options that may include spine injection referrals, medication management, and other evidence-based treatments. The clinic works with most major insurance plans, making it easier to access the care you need. You do not have to keep suffering on your own — reaching out for a professional evaluation is a strong and hopeful first step.

References

• Harden, R. Norman, et al. “Complex Regional Pain Syndrome: Practical Diagnostic and Treatment Guidelines.” Pain Medicine. 2013.
• National Institute of Neurological Disorders and Stroke. “Complex Regional Pain Syndrome Fact Sheet.” National Institutes of Health. 2023.
• Stanton-Hicks, Michael. “Lumbar Sympathetic Block and Neurolysis.” Techniques in Regional Anesthesia and Pain Management. 2001.
• Deer, Timothy R., et al. “The Appropriate Use of Neurostimulation: Stimulation of the Intracranial and Extracranial Space and Head for Chronic Pain.” Neuromodulation. 2014.
• Mayo Clinic Staff. “Nerve Block.” Mayo Clinic. 2023.