What Is a Stellate Ganglion Block?
The stellate ganglion is a collection of sympathetic nerves located in the neck, at the level of the C6-C7 vertebrae. It’s part of the “fight or flight” system. In PTSD, this system gets stuck in overdrive — constantly signaling danger even when no threat exists.
An SGB involves injecting a local anesthetic (typically bupivacaine) near the stellate ganglion under ultrasound or fluoroscopic guidance. The anesthetic temporarily blocks the sympathetic nerve signals, effectively “rebooting” the overactive fight-or-flight response.
The "reboot" theory
In PTSD, the sympathetic nervous system gets "stuck" in an elevated state. Norepinephrine levels remain chronically high, nerve growth factor increases, and the stellate ganglion physically grows additional nerve connections — hardwiring the hyperarousal response.
SGB temporarily blocks this circuit. When the anesthetic wears off (hours), the system restarts at a lower baseline — similar to rebooting a frozen computer. The hyperarousal doesn't return to its pre-injection level because the reset breaks the feedback loop.
How the Procedure Works
You lie on your back or sit upright. The injection site on the neck is cleaned and numbed with a local anesthetic.
Using ultrasound or fluoroscopy, the physician guides a thin needle to the stellate ganglion and injects the local anesthetic. Takes 5-15 minutes.
Within minutes, you may notice a drooping eyelid (Horner's syndrome) on the injection side — this confirms proper placement. It's temporary.
30-60 minute observation. PTSD symptom relief often begins within hours. Many patients describe dramatic reduction in hypervigilance, anxiety, and startle response.
SGB vs. TMS for PTSD
| Factor | SGB | TMS |
|---|---|---|
| Speed | Hours | 2-3 Weeks |
| Sessions | 1-2 injections | 20-36 sessions |
| Target | Peripheral nervous system | Brain circuits directly |
| Evidence Level | Growing (smaller trials) | Strong (large VA trials) |
| Best For | Hyperarousal, fight-or-flight | Full PTSD symptom cluster |
| Insurance | Sometimes (off-label) | Via depression pathway |
Evidence Base
The evidence for SGB in PTSD is growing but still developing:
- A 2019 randomized trial of 108 active-duty service members showed significant PCL-5 score reductions with SGB vs sham at 8 weeks
- A 2020 study in Military Medicine reported that 70% of patients had clinically meaningful improvement after SGB
- The Department of Defense has funded multiple studies and considers SGB a promising intervention
- Several military treatment facilities now offer SGB for PTSD
However, the research base is smaller than for TMS, and long-term durability data is limited.
Cost and Insurance
| Item | Cost |
|---|---|
| Per injection | $1,500-$3,000 |
| Full treatment (2 injections) | $3,000-$6,000 |
| Follow-up evaluation | $200-$400 |
Insurance coverage is inconsistent. Some carriers cover SGB under pain management codes, and some TRICARE plans have covered it for PTSD. The VA provides SGB at several facilities.
When to Consider SGB vs. TMS
SGB may be preferred when: you need rapid PTSD relief (hours, not weeks), hyperarousal is your dominant symptom, and you want minimal treatment visits.
TMS may be preferred when: you want a stronger evidence base, need treatment for co-occurring depression, want insurance coverage, or need a brain-targeted approach for the full PTSD symptom cluster (not just hyperarousal).
Many experts suggest these treatments may work well in combination — SGB for rapid hyperarousal relief, followed by TMS for sustained brain circuit normalization. Use our provider directory to find TMS clinics, and ask about SGB availability at pain management centers in your area.