Post-Traumatic Stress Disorder (PTSD) is more than a psychological condition. Research has shown that PTSD is associated with persistent activation of the sympathetic nervous system, often referred to as the body's "fight-or-flight" response. Individuals with PTSD frequently experience hypervigilance, anxiety, sleep disturbances, exaggerated startle responses, intrusive memories, and autonomic nervous system dysregulation.
One treatment that has received increasing attention in recent years is the Stellate Ganglion Block (SGB), a procedure that involves injecting a local anesthetic around the stellate ganglion, a collection of sympathetic nerves located in the lower cervical region of the neck.
The stellate ganglion is part of the sympathetic nervous system and helps regulate many involuntary functions, including heart rate, blood vessel tone, stress responses, and autonomic nervous system activity.
A stellate ganglion block temporarily interrupts sympathetic nerve signaling. Historically, SGB has been used to treat pain syndromes, vascular disorders, and certain autonomic nervous system conditions. More recently, researchers have investigated its role in PTSD because of the close relationship between sympathetic overactivity and trauma-related symptoms.
Current research suggests that PTSD is associated with excessive sympathetic nervous system activity and persistent autonomic hyperarousal.
Several authors have proposed that SGB may work by reducing this sympathetic overactivation and helping reset abnormal autonomic signaling patterns. By blocking sympathetic outflow through the cervical sympathetic chain, SGB may reduce the physiological state of hypervigilance that characterizes many PTSD patients.
Researchers have also noted connections between the stellate ganglion and limbic brain structures involved in fear processing, emotional regulation, and memory, including the amygdala. Because these regions are often hyperactive in PTSD, modulation of sympathetic signaling has been proposed as one pathway through which SGB may influence PTSD symptoms.
Although the exact mechanism remains under investigation, autonomic modulation remains the leading biological explanation for the observed clinical effects.
Randomized Controlled Trial Findings
One of the most influential randomized clinical trials evaluated two stellate ganglion block procedures administered two weeks apart in active-duty military personnel with PTSD.
Over an eight-week follow-up period, patients receiving SGB experienced significantly greater reductions in PTSD symptom severity compared with patients receiving sham treatment. The adjusted mean reduction in PTSD symptom scores was approximately twice that observed in the placebo group. The investigators concluded that SGB produced meaningful reductions in PTSD symptoms and warranted further study as an adjunctive treatment.
Findings From Recent Systematic Reviews
A 2025 systematic review and meta-analysis evaluating stellate ganglion block for PTSD found that SGB was associated with improvement in PTSD symptoms across the available studies. However, the authors emphasized that the number of randomized controlled trials remains limited and that additional high-quality research is needed to strengthen the evidence base.
The review concluded that current evidence supports the potential efficacy of SGB for alleviating PTSD symptoms, while also highlighting the need for larger and more rigorous studies.
Across published studies, improvements have been reported in several symptom domains, including:
Many investigators believe these improvements may result from modulation of autonomic nervous system activity rather than direct effects on psychological trauma itself. For this reason, SGB is generally viewed as a treatment that may help reduce the physiological manifestations of PTSD and create a more stable nervous system environment for recovery.
The current literature suggests that stellate ganglion block may provide meaningful symptom improvement for some individuals with PTSD, particularly through modulation of sympathetic nervous system activity and autonomic regulation.
The strongest evidence comes from randomized clinical trials demonstrating reductions in PTSD symptom severity compared with sham procedures, while more recent systematic reviews conclude that the overall evidence is promising but still evolving. Researchers consistently emphasize the need for additional large-scale studies to clarify long-term effectiveness, identify optimal treatment protocols, and determine which patient populations are most likely to benefit.
Current research supports the concept that stellate ganglion block may influence PTSD by modulating the sympathetic nervous system and reducing autonomic hyperarousal. Clinical studies have demonstrated improvements in PTSD symptom severity in several patient populations, although results have not been uniformly consistent across all trials. The evidence to date suggests that SGB may serve as a valuable adjunctive treatment for PTSD while ongoing research continues to define its role within comprehensive trauma care.
https://pmc.ncbi.nlm.nih.gov/articles/PMC6695947/
https://www.sciencedirect.com/science/article/pii/S1566070225001225
https://pmc.ncbi.nlm.nih.gov/articles/PMC12999755/
https://www.ncbi.nlm.nih.gov/books/NBK442253/
https://jamanetwork.com/journals/jamapsychiatry/fullarticle/2767290
https://drseanmulvaney.com/stellate-ganglion-block-for-ptsd/
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