Sympathetic nerve block.
A sympathetic nerve block injects anesthetic near the sympathetic nerves to interrupt pain signals. These nerves help regulate automatic functions like blood flow — and when they propagate pain, blocking them can bring relief for conditions that are otherwise hard to manage, such as CRPS and Raynaud's syndrome.
What to expect
Switching off the pain pathway.
The sympathetic nervous system controls automatic functions like heart rate, blood flow, and sweat — and it can also carry and amplify certain kinds of pain.
Calming overactive nerves
Anesthetic is injected near the sympathetic nerves that run alongside your spine, effectively turning off the pain signals they emit. Beyond easing pain, the response can help your physician confirm whether the sympathetic system is the source.
- Upper-body (stellate ganglion) blocks treat the head, neck, chest, and arms
- Lower-body (lumbar sympathetic) blocks treat the legs
- The pattern of relief helps pinpoint the pain source
Image-guided sympathetic block
Under fluoroscopy, anesthetic is injected near the sympathetic chain on either side of the spine. A stellate ganglion block addresses upper-body pain; a lumbar sympathetic block addresses lower-extremity, neuropathic, and vascular pain.
- Reduces inflammation around the targeted nerves
- Duration of relief ranges from days to weeks
- A series of blocks may be needed for lasting benefit
Conditions a block
can help.
Sympathetic nerve blocks are especially valuable when standard pain management strategies haven't worked.
Complex regional pain syndrome
CRPS involves severe chronic pain, often in an arm or leg, frequently following an injury, surgery, or stroke. A block can disrupt the misguided nerve signals.
Phantom limb pain
After an amputation, pain may feel like it comes from the missing limb. A block can ease it by quieting the nerve activity perceived as pain.
Raynaud's & vascular pain
By relaxing affected vessels and nerves, blocks can improve blood flow in conditions like Raynaud's syndrome and other vascular pain.
Hyperhidrosis & abdominal pain
Blocks can reduce excessive sweating from overactive sympathetic nerves, and relieve chronic stomach pain driven by abdominal sympathetic chains.
What the visit looks like.
Prepare
You'll generally fast for several hours, and some medications may be paused or adjusted. Consent and a brief evaluation come first.
The block
Using fluoroscopy to locate the target, the area is numbed and medication is injected near the nerves. Each block takes about 15 to 30 minutes.
Observation
You're monitored for a few hours. Temporary soreness, warmth, or weakness in the treated area is normal and usually resolves within hours.
Support recovery
Most patients resume normal activities the next day. Physical therapy or pain medication may be recommended to build on the relief.
Frequently asked questions
How long does the pain relief last?
It varies significantly, typically lasting from several days to a few weeks, depending on your condition and response to the block.
Is the procedure painful?
You may feel a brief, mild discomfort during the injection, but the procedure is generally well-tolerated thanks to local anesthetic.
Are there any permanent effects?
Sympathetic nerve blocks are generally a temporary solution for pain management and don't typically cause permanent changes or effects.
How many treatments are typically required?
It varies. Some patients find relief after one block, while others need a series of blocks to achieve significant pain reduction.
Are there alternatives to sympathetic nerve blocks?
Yes — alternatives may include medications, physical therapy, lifestyle changes, or other interventional pain management techniques, depending on the condition.
Is the procedure covered by insurance?
Most insurance providers cover sympathetic nerve blocks when deemed medically necessary, though coverage can vary. Verify your benefits before the procedure.
Looking for relief that's hard to find?
Book with a board-certified pain physician at a location near you. We'll evaluate whether a sympathetic nerve block is right for your condition.