A Needle in the Neck Is Not a Test: How a Stellate Ganglion Block Is Proven to Have Worked

What this video covers

• What the stellate ganglion is, where it sits at C7 and the first rib, and why the needle target is the C6 Chassaignac tubercle one level above
• The leading theory of how sympathetically maintained pain develops, alpha-1 adrenergic receptors appearing on injured nerve fibers so that the body’s own adrenaline can drive pain, and why it is still a proposed mechanism rather than a settled one
• Why ultrasound guidance matters: seeing the carotid and vertebral arteries, thyroid, esophagus, and longus colli muscle instead of relying on surface landmarks
• How successful sympathetic blockade is confirmed objectively by a drooping eyelid, a red eye, and a measurable rise in hand temperature, and why a negative result still has to be interpreted carefully
• What the randomized sham-controlled trial in active-duty service members actually showed, why using this block for post-traumatic stress remains an off-label and investigational use, and what the Cochrane review on complex regional pain syndrome did not show
• The real risks, from temporary hoarseness and difficulty swallowing to the rare but serious events documented in the safety literature, including hematoma, pneumothorax, and infection
• MEDICAL DISCLAIMER: This content is for educational purposes only and is not medical advice. It does not substitute for professional diagnosis or treatment. Always consult a licensed healthcare provider regarding your condition. Viewing this video does not establish a doctor-patient relationship.

Put both hands flat on the table. One of them no longer looks like it belongs to you. The skin across the knuckles is glossy and stretched. The color drifts through the day — mottled and dusky by morning, blotched red by evening. It is colder than the other hand, and you can prove that with a thermometer. A bedsheet dragged across it registers as a burn.

Or there is nothing visible at all. Something happened to you — combat, an assault, a highway collision — and your body never stood down. Your resting heart rate will not settle. You sleep in fragments. A car door closing three houses away puts you on the ceiling.

Both of those patients get referred for the same injection into the front of the neck: a stellate ganglion block. And both are commonly failed, in two different ways. Some arrive having had three, four, five of these blocks, with not one line in the chart recording whether the sympathetic chain was ever actually blocked. No eyelid noted. No hand temperature before and after. A needle went into a neck and the encounter generated no information at all. That is not a diagnostic test.

This article explains what the stellate ganglion is, why blocking a nerve that carries no pain fibers can change a burning hand, how adequate blockade is confirmed objectively, and what the published evidence does and does not support.

What the stellate ganglion actually is

Its reputation misleads people, so start with the anatomy.

The stellate ganglion is not a sensory nerve. It is the fused cervicothoracic sympathetic ganglion, seated at the transverse process of the seventh cervical vertebra, near the neck of the first rib. It is the relay station for sympathetic outflow — the “fight or flight” wiring — to the head, the neck, the upper limb, and the heart.

It carries no pain fibers from your hand.

So why block it for a burning hand? Two proposed reasons, and they do not have equal standing.

Sympathetically maintained pain. In animal models of nerve injury, injured pain fibers begin expressing alpha-1 adrenergic receptors on their surface. Once those receptors appear, norepinephrine — your own adrenaline chemistry — directly excites the very fibers that report damage. The pain system starts answering to the stress system.

Be exact about the status of that idea: it is the leading proposed explanation. It is not proven in humans, and anyone who states it as fact has walked past the data. Treat it as investigational whenever a procedure is being justified to you on its basis.

Sustained sympathetic vasoconstriction. This one is visible to the eye. Persistent sympathetic tone clamps down the small vessels of the hand. That is the cold, mottled, swollen limb of complex regional pain syndrome — perfusion falling at exactly the moment inflamed tissue demands more of it.

Why that produces the hand you are living with

If the sympathetic system is driving pain fibers directly, then the pain is no longer proportional to tissue damage. It tracks arousal instead. That is why a limb can burn worse on a bad day, in a cold room, or after a startle, with nothing new having happened to the tissue itself — and why the burning does not behave the way a healing injury behaves.

If the same system is throttling blood flow, you get the other half of the picture: the coldness you can measure with a thermometer, the glossy stretched skin, the color that drifts from dusky violet to blotched red across a single day, the swelling that will not settle.

Those two mechanisms explain why the hand looks wrong and feels wrong at the same time, and why a radiograph showing a fracture that healed cleanly is no reassurance at all. The bone is fine. The hand is not.

Then there is the second kind of patient — the one whose nervous system never came down from what happened. The stellate ganglion relays sympathetic outflow to the heart as well as to the hand. This block has been studied in post-traumatic stress, in a single randomized trial described further down this page, and what that trial found is more modest than the marketing suggests.

What standard care misses: the differential, and the missing receipt

Two failures dominate, and they compound each other.

A burning arm is a complaint, not a diagnosis

It has at least five plausible authors, and each has a discriminating test that costs nothing compared with a neck injection:

• Cervical radiculopathy at the sixth or seventh nerve root follows a dermatome, reproduces with a Spurling maneuver, and declares itself on electrodiagnostic study.
• Thoracic outlet syndrome is positional — provoked by arm elevation.
• Peripheral polyneuropathy is bilateral and stocking-glove. In this practice it is frequently driven by hyperinsulinemia. No sympathetic block corrects that, and reaching for one instead of a fasting insulin is malpractice by omission.
• Post-herpetic neuralgia sits in one dermatome and carries a shingles history — which you have to ask for.
• Sympathetically maintained pain is what is left when the others are excluded, not what you assume at the start.

Every one of those has been injected in the neck by somebody who never sorted them out. And when the injection did nothing, the patient was blamed for being difficult.

The block was never verified

The second failure is quieter and more common. An injection is performed and no measurement is recorded. No eyelid. No pupil. No hand temperature before and after. When that happens, a negative result is uninterpretable — nobody can tell whether the sympathetic chain was blocked and the pain was unmoved, or the block simply missed. So the injection gets repeated, and the same non-answer gets generated again.

There is a commercial version of the same failure: storefronts selling this block as a “nervous-system reset,” cash up front, package of three, no mental health clinician in the building. That is not medicine either.

Where the needle goes, and why one level above the target

The needle target is not the ganglion itself. It is the Chassaignac tubercle — the anterior tubercle of the sixth cervical transverse process, one full level above the structure being blocked. Local anesthetic is deposited deep to the prevertebral fascia over the longus colli muscle and allowed to spread downward along that plane.

Going high is deliberate. Lower down, the vertebral artery lies exposed and the dome of the lung is close. That level buys margin, and margin is the whole game in the front of the neck.

Ultrasound is not a luxury here. The older landmark technique had the physician palpate the tubercle, push the carotid aside, and inject into anatomy that could not be seen. Under ultrasound, the carotid artery, the vertebral artery, the internal jugular vein, the thyroid, the esophagus, and the longus colli are all visible, and the needle tip is watched as it advances into the intended layer. Full procedural detail — preparation, what the appointment involves, and recovery — is on our stellate ganglion block treatment page.

The receipt: how adequate blockade is proven

This is what separates a diagnostic block from a ritual. Adequate sympathetic blockade announces itself objectively, within minutes, and every one of these signs belongs in your chart:

• Ptosis and miosis — the eyelid droops and the pupil constricts on the treated side. That pairing is Horner syndrome, the classic marker that the cervical sympathetic chain has been interrupted.
• Conjunctival injection — the eye on that side reddens.
• A measurable rise in skin temperature in the affected hand, documented before and after with a thermometer.

Those signs are the receipt. Ask for them. If nobody measured the temperature of that hand before and after, nobody learned anything.

Here is the reasoning the receipt makes possible. If sympatholysis is documented and your pain is unchanged, sympathetically maintained pain becomes far less likely — and the plan changes that day. That is a useful answer, not a failure. An injection that has told you it is the wrong lever should not be repeated.

One important caution: a negative result gets interpreted, not obeyed. An incomplete block can produce a false negative, and fibers of Kuntz — sympathetic pathways that bypass the ganglion — can carry outflow around the level that was blocked. A single unconvincing result is a data point, not a verdict.

What the evidence actually shows

You deserve this unvarnished, because the evidence differs sharply by condition.

For complex regional pain syndrome, the evidence is weak. The Cochrane review by O’Connell and colleagues, published in 2016, pooled 12 studies with 461 participants, judged every one of them to be at high or unclear risk of bias, rated the overall quality of evidence low to very low, and concluded that the limited data available do not suggest that local anesthetic sympathetic blockade is effective for reducing pain in this condition.¹ That review’s literature search closed in September 2015 — a decade-old and thin evidence base.

That finding is not softened here. In this practice the block is therefore used primarily as a diagnostic instrument, and secondarily as an adjunct that opens a window for the work that actually rebuilds a limb: desensitization, graded motor imagery, mirror therapy, progressive loading. It is the anesthetic for the rehabilitation, not the rehabilitation.

For post-traumatic stress, there is one trial, and it is real, modest, and investigational. The randomized, sham-controlled trial by Rae Olmsted and colleagues, published in JAMA Psychiatry in 2020, enrolled 113 active-duty service members randomized 2:1 (74 to block, 39 to sham), of whom 91 — 80 percent — met full criteria on the CAPS-5, at mild-to-moderate baseline severity.² Participants received two right-sided blocks, at week 0 and week 2. By eight weeks, adjusted symptom scores had fallen 12.6 points (95% CI −15.5 to −9.7) in the block group against 6.1 points (95% CI −9.8 to −2.3) with sham, P = .01.

The authors themselves noted that the mild-to-moderate baseline severity and the short follow-up limit how far those findings generalize, and concluded only that the block merits further trials as a treatment adjunct. Stated plainly: for post-traumatic stress this use is off-label and investigational, appropriate only alongside trauma-focused therapy and medication — never instead of them. Do not start, stop, or change any medication without consulting your physician.

The risks are uncommon but real. Goel and colleagues, in Regional Anesthesia and Pain Medicine in 2019, screened 1,909 articles published between January 1990 and November 2018 and catalogued 260 reported adverse-event cases across 67 included studies; imaging guidance was used in 134 of those 260 cases (51.5%), and 178 (68.4%) were medication-related or systemic while 82 (31.5%) were procedure-related or local.³

• Common and temporary, and familiar from ordinary practice: hoarseness, difficulty swallowing, a heavy eyelid. Hours, not days.
• Rare and serious: seizure from intravascular injection; hematoma causing airway obstruction, including the one reported death in that review; and cervical epidural abscess, including the one reported case of quadriplegia.

Because that review collects reported cases rather than following a defined population, it documents what can happen — it does not supply an incidence rate. One procedural rule holds here regardless of what any review counted: both sides are never blocked in the same session, because blocking both recurrent laryngeal nerves can compromise an airway. That is a safety convention of practice, not a finding of the review.

And one expectation set by clinical practice rather than by a trial, applying across every indication: the benefit of a single block is measured in weeks, not years.

What this means for your evaluation

The sequence is not negotiable, and it is the same for both kinds of patient described at the top of this page.

First, settle the differential. Radiculopathy, thoracic outlet syndrome, polyneuropathy, and post-herpetic neuralgia are excluded by history, examination, electrodiagnostic study, and — where the picture is stocking-glove and bilateral — metabolic laboratory work including a fasting insulin. A needle is not opened until that is done.

Second, do the block under ultrasound and prove it. Horner syndrome, conjunctival injection, and a documented hand-temperature change, recorded before and after.

Third, decide what the result means. Documented sympatholysis with unchanged pain is an answer, and it redirects care the same day. Relief confirms a sympathetic contribution — and starts a clock, because a window that is not spent on rehabilitation is wasted.

Here is what that looks like in practice. What follows is a composite — a picture assembled from many patients with this condition, not one person’s chart. A patient arrives months after a wrist fracture that healed cleanly on film. The bone is fine; the hand is not. It is cold, swollen, glossy, and so sensitive that a shirt cuff is intolerable. The arm hangs unused and the shoulder is stiffening. First block: Horner syndrome within minutes, hand temperature up several degrees, pain dropping sharply — for four days. Not forever. That window told us the sympathetic contribution was real, and that it was not the whole disease.

The hard part came afterward. A short series of blocks was timed so each one covered a therapy session. The point was never the injection; it was getting that hand to tolerate being used. The worst day was the day the therapist asked for weight through a burning palm. Between visits, the terrain that keeps a nervous system sensitized was addressed — wrecked sleep, and a fasting insulin nobody had ever checked. Nutrition moved toward whole, anti-inflammatory food. Pro-resolving lipid mediators and near-infrared light were discussed honestly: adjunctive and emerging, not standard of care.

Months later that hand does most of what a hand should do, and color has largely normalized. Cold weather still bites, and probably always will. That is a real outcome, not a cure, and it is a practice observation rather than a trial result. Individual results vary.

If your hand burns and runs cold, or your nervous system has never come down from what happened to you, bring the question to someone who will measure the answer. And whoever performs the block, ask for one thing before you leave: the temperature of that hand, before and after.

Frequently asked questions

Key takeaways

• The stellate ganglion is the fused cervicothoracic sympathetic ganglion at the C7 transverse process; it carries no pain fibers from your hand, and the idea that norepinephrine drives injured pain fibers through newly expressed alpha-1 adrenergic receptors is the leading proposed explanation, demonstrated in animal models and not proven in humans.
• The needle target is the C6 Chassaignac tubercle, one level above the ganglion, chosen for margin from the vertebral artery and the dome of the lung; ultrasound shows the carotid, vertebral artery, thyroid, esophagus, and longus colli that landmark technique cannot.
• A block without documented Horner syndrome, conjunctival injection, and before-and-after hand temperature generates no information — and a documented block with unchanged pain is a useful answer that should redirect care, subject to the false-negative caveats of incomplete blockade and fibers of Kuntz.
• The evidence differs by condition: low to very low quality evidence not supporting sympathetic blockade for pain in complex regional pain syndrome, and a single sham-controlled trial in post-traumatic stress showing a real but modest effect that the authors framed as warranting further study of an adjunct — off-label and investigational, never a replacement for trauma-focused therapy or medication.
• Serious complications are rare but documented, both sides are never blocked in one session, benefit lasts weeks rather than years, and the block is worth doing mainly when rehabilitation is already scheduled to fill the window it opens.

Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP — Board Certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine. Last reviewed July 2026.

This article is educational and is not a substitute for evaluation, diagnosis, or treatment by a physician. Individual results vary. Do not start, stop, or change any medication without consulting your physician. To be evaluated, request an appointment at painmd.tv, call (314) 481-5000, or text (314) 886-5902.

References

1. Rae Olmsted KL, Bartoszek M, Mulvaney S, et al. Effect of stellate ganglion block treatment on posttraumatic stress disorder symptoms: a randomized clinical trial. JAMA Psychiatry. 2020;77(2):130-138. PMID 3169308310100120193474. PubMed
2. O’Connell NE, Wand BM, Gibson W, Carr DB, Birklein F, Stanton TR. Local anaesthetic sympathetic blockade for complex regional pain syndrome. Cochrane Database Syst Rev. 2016;7(7):CD004598. PMID 27467116101002146518580045984. PubMed
3. Goel V, Patwardhan AM, Ibrahim M, Howe CL, Schultz DM, Shankar H. Complications associated with stellate ganglion nerve block: a systematic review. Reg Anesth Pain Med. 2019;44(6):669-678. PMID 309924141011362018100127. PubMed

Dr. Gurpreet Singh Padda, MD, MBA, MHP