Stellate ganglion block has moved from a niche pain management technique to one of the most closely watched interventions in trauma treatment — and for good reason. A randomized controlled trial published in JAMA Psychiatry found it significantly reduced PTSD symptom severity compared to a sham procedure, a finding that has held up across multiple peer-reviewed studies in veteran and civilian populations alike. At Oasis Therapeutics, we offer SGB at our Nashua and Concord, New Hampshire clinics, performed by board-certified physicians with specialized training in interventional procedures, and this guide covers everything a prospective patient needs to understand before deciding whether it is right for them.
The Neuroscience Behind SGB and PTSD
To understand why stellate ganglion block may help with PTSD, it helps to understand what PTSD does to the nervous system. Post-traumatic stress disorder is not simply a psychological response to a difficult memory — it is a physiological condition in which the brain’s threat-processing system becomes dysregulated in lasting ways. The amygdala — the brain region centrally involved in detecting and responding to fear and stress — plays a central role in this dysregulation (National Institutes of Health). In PTSD, the amygdala and the broader fear-memory circuitry remain in a heightened state long after the traumatic event, producing the hallmark symptoms: intrusive memories, hypervigilance, exaggerated startle responses, emotional numbing, and persistent avoidance.
The sympathetic nervous system — the branch of the autonomic nervous system that governs fight-or-flight responses — is the physiological engine driving much of this overactivation. The stellate ganglion, a cluster of sympathetic nerve cell bodies located in the neck on either side of the voice box, plays a regulatory role in this system. Research suggests that in PTSD, changes in nerve growth factor (NGF) activity near the stellate ganglion may contribute to the persistence of symptoms by keeping sympathetic tone chronically elevated (National Institutes of Health).
By injecting a local anesthetic — a medication that temporarily blocks nerve signal transmission — near the stellate ganglion, SGB reduces the sympathetic overactivation at its source. The result, for many patients, is a meaningful reduction in the physiological intensity of PTSD symptoms that allows other treatments and day-to-day functioning to work more effectively.
What the Evidence Shows
The evidence base for SGB in PTSD has developed substantially in recent years. The JAMA Psychiatry randomized controlled trial — one of the most rigorous study designs available in clinical research, involving a comparison group that received a sham injection — found that SGB produced statistically significant reductions in PTSD symptom severity (JAMA Psychiatry). This distinguishes SGB from treatments supported only by anecdotal reports or small uncontrolled studies.
Additional peer-reviewed research supports SGB’s effectiveness for PTSD, including in patients with treatment-resistant presentations who have not responded adequately to medications or psychotherapy (National Institutes of Health). Studies have also examined repeated SGB administration, with findings suggesting that some patients benefit from more than one injection over time, particularly those with more severe or long-standing symptoms.
It is important to be clear about what the evidence does and does not claim. SGB is not a cure for PTSD, and results vary by individual. Not every patient experiences the same degree of benefit. The research supports SGB as an effective option for many patients — particularly those who have not responded to first-line treatments — not as a universal solution. For a broader look at how SGB compares to other PTSD and anxiety interventions, see our overview of SGB therapy for PTSD and anxiety.
A Step-by-Step Guide to the Procedure
The following describes the SGB procedure as performed at Oasis Therapeutics. Every patient’s experience is individualized, and your physician will explain any variations relevant to your specific case at your consultation.
1. Initial consultation and evaluation. Before any procedure is scheduled, you will meet with one of our physicians for a thorough evaluation. We review your full medical and psychiatric history, all current medications, prior treatment experiences, and any relevant medical conditions. We assess for contraindications — including certain vascular conditions and bleeding disorders — and determine whether SGB is clinically appropriate for your situation. If we believe another treatment would serve you better, we will say so directly.
2. Pre-procedure preparation. On the day of the procedure, you should arrange for someone to drive you home. You will be asked about any changes to your medications or health since the consultation. The procedure does not require fasting or sedation, so you can eat and take your regular medications as normal unless instructed otherwise.
3. Positioning. You will be positioned on your back on the procedure table with your neck slightly extended. This position allows the physician access to the injection site and optimal visibility under imaging guidance.
4. Imaging setup. Imaging equipment — either fluoroscopy (real-time X-ray) or ultrasound — is positioned to provide a clear, real-time view of the structures in the neck. At Oasis Therapeutics, imaging guidance is used for every SGB procedure without exception. This is the single most important factor in both the safety and accuracy of the injection.
5. Skin preparation and local anesthetic. The injection site is cleaned with antiseptic solution, and a small amount of local anesthetic is applied to the skin surface to minimize discomfort from the needle.
6. The injection. Under continuous imaging guidance, the physician carefully advances a thin needle through the skin and soft tissue of the neck to the precise location of the stellate ganglion. Once correct placement is confirmed on imaging, the anesthetic solution is slowly injected. The injection itself takes a few minutes. The full procedure, from positioning to completion, is typically done within 20 minutes.
7. Immediate post-procedure monitoring. You will remain in the clinic for a period of monitoring after the injection. During this time, expected effects of the block become apparent: a sensation of warmth or heaviness in the arm on the treated side, a slight drooping of the eyelid on the same side (Horner’s syndrome — a predictable and temporary sign that the block has taken effect), and possibly a mildly hoarse voice. These effects are monitored by our clinical staff and typically begin to resolve within a few hours.
8. Discharge and follow-up. Once monitoring is complete and expected post-procedure effects are confirmed to be resolving, you will be cleared to leave with your driver. You will receive instructions on what to watch for and how to contact us if any concerns arise. A follow-up is scheduled to assess your response to the procedure and determine whether additional sessions are appropriate.
How Many Sessions Are Needed
The number of SGB injections that produces optimal results varies by individual. Some patients experience significant and lasting relief after a single injection. Others benefit from a series of injections spaced over several weeks or months, particularly those with more severe or chronic PTSD presentations. Peer-reviewed research on repeated SGB administration supports its value for patients who respond to the initial injection but experience a gradual return of symptoms over time (National Institutes of Health).
We do not operate on a fixed protocol for all patients. Your response to the first procedure — assessed at your follow-up appointment — guides the conversation about whether and when additional sessions are warranted. We make these decisions collaboratively with you.
SGB as Part of a Broader Treatment Plan
SGB works most effectively as part of a comprehensive approach to PTSD rather than as a standalone treatment. At Oasis Therapeutics, we often discuss SGB alongside other options we offer, including ketamine infusion therapy for patients with significant depressive or anxiety symptoms alongside PTSD, and transcranial magnetic stimulation (TMS) for those whose mood disorder component has not responded to medications. We also encourage all patients to maintain or pursue a therapeutic relationship with a mental health provider, as clinical treatment and psychotherapy address different aspects of the same condition and work better together than either does alone.
Our care is designed to integrate with whatever you already have in place. We communicate with outside providers when you consent to that coordination, and we build treatment plans around your full picture rather than a single diagnosis. Veterans and first responders in particular often benefit from our specialized programming, which is designed to address the unique trauma exposures common to these populations.
Two Barriers We Hear Regularly
Fear of the procedure itself. The neck is an anatomically meaningful location, and it is reasonable to feel cautious about an injection there. The honest answer is that SGB, performed under imaging guidance by a physician experienced in interventional techniques, is a well-tolerated procedure for the vast majority of patients. Serious complications are rare. We walk through every aspect of the procedure in detail at the consultation, answer every question, and do not move forward until you feel fully informed. Results vary by individual, and we never pressure anyone into a procedure they are not ready for.
Insurance and out-of-pocket costs. SGB coverage varies by insurance plan and the condition being treated. Our care coordination team verifies your specific benefits before any treatment is scheduled, and we are transparent about what costs you may be responsible for before you commit to anything. For patients whose plans do not cover SGB, we offer discounted direct-payment rates and financing through CareCredit. HSA and FSA funds are eligible. We encourage you to reach out so we can work through the coverage question with you directly.
Frequently Asked Questions
How long does it take to feel the effects of SGB for PTSD? Some patients report noticeable changes within hours of the procedure. Others experience a more gradual shift over the days and weeks that follow. The timeline varies, and your response to the first injection is one of the most useful data points for guiding subsequent treatment decisions.
Is SGB the same as an epidural? No. An epidural is an injection into the epidural space of the spine, typically used for pain management during labor or surgery. SGB is an injection near a sympathetic nerve cluster in the neck. The two procedures target completely different anatomical locations and work through different mechanisms.
Will I be sedated or put under for the procedure? No. SGB does not require general anesthesia or sedation. You will be awake and alert throughout. Many patients find the procedure significantly less uncomfortable than they anticipated.
Can SGB make PTSD symptoms worse? A temporary increase in awareness of symptoms is occasionally reported in the hours after the procedure, as the nervous system adjusts. This is not common, but it is something we discuss with patients so they are not caught off guard. Persistent worsening of symptoms is not expected and would be reason to contact us promptly.
How is SGB different from ketamine infusion therapy for PTSD? They work through entirely different mechanisms and address different aspects of the condition. SGB targets the sympathetic nervous system directly through a localized injection. Ketamine infusion therapy works through the brain’s glutamate system and produces rapid antidepressant effects. Some patients benefit from both, either in sequence or as part of a combined plan. We assess which approach — or which combination — is most appropriate based on your individual presentation.
Key Takeaways
- SGB involves a precisely placed injection of local anesthetic near the stellate ganglion — a sympathetic nerve cluster in the neck — to reduce the chronic nervous system overactivation that underlies PTSD symptoms.
- A randomized controlled trial published in JAMA Psychiatry found SGB significantly reduced PTSD symptom severity compared to a sham procedure; additional peer-reviewed research supports its use in treatment-resistant presentations.
- At Oasis Therapeutics, imaging guidance is standard for every SGB procedure, and the procedure is performed by board-certified physicians with specialized training in interventional techniques.
- The number of sessions needed varies by individual; some patients achieve lasting benefit from one injection, while others benefit from a series over several weeks or months.
- SGB works best as part of a broader treatment plan that may include ketamine infusion therapy, TMS, and ongoing psychotherapy. Results vary by individual.
The research behind SGB for PTSD is substantive, and the procedure itself is more straightforward than many patients expect. If you are in Nashua or Concord and want to understand whether SGB is appropriate for your situation, we are ready to have that conversation. Call us or schedule a consultation through our website, and we will start with a thorough evaluation and give you honest answers about what to expect. We encourage you to discuss all treatment options with your healthcare provider as part of that process.
References
JAMA Psychiatry. Effects of Stellate Ganglion Block on PTSD Symptoms. https://jamanetwork.com/journals/jamapsychiatry/fullarticle/2753810
National Institutes of Health. Stellate Ganglion Block for PTSD. https://pmc.ncbi.nlm.nih.gov/articles/PMC6865253/
National Institutes of Health. Fear, Stress, and the Amygdala. https://pmc.ncbi.nlm.nih.gov/articles/PMC2882379/
Medical Disclaimer
The information in this blog is for educational purposes only and does not constitute medical advice. Stellate ganglion block and all other treatments described should only be pursued under the supervision of a licensed provider familiar with your full medical and psychiatric history. Individual results vary. Not all treatments are appropriate for all patients. If you are experiencing a mental health crisis or thoughts of self-harm, please call or text 988 to reach the Suicide and Crisis Lifeline or go to your nearest emergency room.