What a Stellate Ganglion Block Targets in Menlo Park, CA

The body has an alarm system. It is useful when danger is present. It becomes harder to live with when the alarm stays active after the immediate threat has passed.

A stellate ganglion block, or SGB, is a medical procedure that targets part of the sympathetic nervous system in the neck. At Soft Reboot Wellness, we believe the procedure deserves a clear explanation before anyone considers whether it belongs in their care. It is not a vague “reset.” It is an intervention with specific anatomy, a defined purpose, and important limits.

The sympathetic nervous system is built for rapid response

The sympathetic nervous system is one branch of the autonomic nervous system. It helps regulate automatic functions, including heart rate, blood pressure, sweating, pupil size, and vascular tone. It is often described as the fight-or-flight system. That phrase is memorable, although the physiology is more complex.

When the brain perceives danger, sympathetic signals help prepare the body to act. The heart may beat faster. Breathing can become shallower. Muscles may tighten. Attention narrows. These responses can be protective in a true emergency.

They are also meant to change over time.

Research into cardiac autonomic pathways illustrates how extensively sympathetic nerves influence cardiovascular signaling and rhythm regulation in work on cardiac autonomic neuromodulation (Wong et al., 2025). The stellate ganglion is one point within this broad network. It is not the entire system, and an SGB does not erase the body’s capacity to respond to stress.

The stellate ganglion sits at a crossroads in the neck

The stellate ganglion is a collection of sympathetic nerve cells located low in the neck, near the base of the cervical spine. It is generally formed by the lower cervical and upper thoracic sympathetic ganglia joining together. From this region, sympathetic signals travel toward the head, neck, upper chest, and arm.

Because the ganglion has connections to the heart and upper body, it has long been relevant in anesthesia and pain medicine. Reviews of peripheral neuromodulation describe the stellate ganglion as part of the sympathetic innervation that can influence cardiac electrical activity through sympathetic nerve pathways (Benabou et al., 2025).

That anatomy matters. A stellate ganglion block is not a procedure performed “in the brain.” It is an injection near a sympathetic nerve structure in the neck, intended to temporarily interrupt signaling through that pathway.

What a stellate ganglion block does, and does not do

During an SGB, a qualified clinician places a local anesthetic near the stellate ganglion, typically using imaging guidance to help identify the appropriate anatomy. The medication can temporarily reduce sympathetic nerve activity in the region.

The immediate physical signs may include warmth or redness in one arm or side of the face, nasal stuffiness, a drooping eyelid, or a change in voice. One classic temporary sign is Horner’s syndrome, which can include a smaller pupil and eyelid drooping on the treated side. These signs can be expected effects of the local anesthetic reaching the sympathetic pathway. They still require clinical observation and context.

The procedure does not diagnose the cause of a person’s symptoms. It does not substitute for psychotherapy, psychiatric care, primary care, sleep care, or other medical evaluation. It also does not offer one predictable experience for every patient.

Studies continue to examine SGB in several settings. For example, a review of postoperative sleep research describes an active but still developing evidence base around SGB and postoperative sleep disturbance in emerging clinical research (Luo et al., 2025). That kind of research is useful, but it does not mean every potential use is established or appropriate for every person.

Why the nervous system can feel stuck on high alert

People often describe a body that feels unable to settle. They may notice rapid heartbeat, muscle tension, disrupted sleep, exaggerated startle, sweating, or a persistent sense of bracing. Those experiences deserve thoughtful assessment. They can arise from many causes, including medical conditions, medication effects, substance use, sleep disruption, anxiety, trauma exposure, and chronic stress.

We do not assume that one procedure explains or resolves a complex health picture. We start with the details. What is happening in your body? When did it begin? What makes it better or worse? What care have you already tried? Are there medical factors that need attention first?

For people exploring care related to trauma, we also recognize that symptoms are not merely a list. They affect work, relationships, sleep, concentration, and the ability to feel present. Our discussion of personalized PTSD care reflects the need for individualized, integrated support rather than a single explanation for every experience.

Why physician-led evaluation matters

The neck contains important structures. An SGB should be approached with care, technical precision, and appropriate medical screening. Before discussing candidacy, we consider your health history, current medications, allergies, blood-thinning medications, prior procedures, and the symptoms that brought you in.

Potential risks can include bleeding, infection, temporary voice changes, swallowing difficulty, dizziness, seizure, accidental injection into a blood vessel, lung injury, nerve injury, or an allergic reaction. Serious complications can occur and should be reviewed during individualized informed consent. Whether a procedure is appropriate, which side to treat, and what monitoring is needed all require individualized medical evaluation.

We also discuss what is known and what remains uncertain. A randomized clinical trial in people with acquired brain injury evaluated ultrasound-guided right-sided SGB for acute paroxysmal sympathetic hyperactivity, showing that the procedure is being studied in carefully defined clinical contexts under controlled conditions (Wang et al., 2026). Research in one population does not automatically translate to another.

How we approach the conversation

At our Menlo Park and San Francisco locations, we offer stellate ganglion block care within a physician-led setting. Our role is not to rush you toward a procedure. It is to help you understand the physiology, review potential benefits and risks, and decide whether further evaluation makes sense.

Some patients are also considering other forms of care. Questions about IV ketamine therapy or ketamine-assisted psychotherapy deserve their own conversation. Ketamine for psychiatric uses is off-label, and it should not be treated as interchangeable with an SGB. Each option has different mechanisms, evidence, risks, and clinical considerations.

A survey of behavioral health clinicians found interest in SGB as an intervention while also highlighting the need for stronger clinical evidence and careful integration with broader treatment in clinician perspectives on the procedure (Lynch et al., 2021). We share that measured view. Curiosity is reasonable. So is caution.

FAQ

Is a stellate ganglion block surgery?

No. It is an injection procedure, not open surgery. Even so, it involves sensitive anatomy and should be performed by an appropriately trained clinician with proper monitoring and safety practices.

Will I be asleep during the procedure?

Many patients remain awake, though comfort planning varies. We discuss what the procedure may feel like, what monitoring is used, and what you can expect afterward during your consultation.

How long does a stellate ganglion block last?

The local anesthetic effect is temporary. Individual experiences and the duration of any changes vary. We do not promise a particular result or timeline.

Is an SGB appropriate for everyone with stress symptoms?

No. Stress symptoms can have many causes, and not every person is a candidate. A careful health history and medical evaluation are essential before considering any procedure.

Key takeaways

A stellate ganglion block targets sympathetic nerve signaling near the base of the neck. Its purpose is specific. Its effects can be temporary. Its evidence base is still evolving across different clinical settings.

We believe you deserve more than a simplified explanation. You deserve a conversation that accounts for your health history, current symptoms, safety, and goals. If you would like to discuss whether an evaluation is appropriate, we invite you to contact us at (650) 419-3330.

This article is for general educational purposes only. It is not medical advice and is not a substitute for individualized evaluation, diagnosis, or treatment by a qualified clinician.

If you are in immediate danger or thinking about harming yourself, call or text the 988 Suicide and Crisis Lifeline (988 Suicide and Crisis Lifeline, n.d.) for 24/7 confidential support, or call 911 in an emergency.

Works Cited

1. Wong B, et al. Neuromodulation of the Cardiac Autonomic Nervous System for Arrhythmia Treatment. https://pubmed.ncbi.nlm.nih.gov/40722846/

2. Benabou L, et al. Cardiac Sympathetic Innervation and Ventricular Arrhythmias in Structural Heart Disease: Current Peripheral Neuromodulation Therapies and Emerging Therapeutic Targets. https://pubmed.ncbi.nlm.nih.gov/41524080/

3. Luo J, et al. Targeting postoperative sleep disorders: Current advances and emerging directions in stellate ganglion block therapy. https://pubmed.ncbi.nlm.nih.gov/40696697/

4. Wang T, et al. Efficacy and Safety of Ultrasound-Guided Right-Sided Stellate Ganglion Block for Reducing the Severity and Duration of Acute Paroxysmal Sympathetic Hyperactivity in Patients with Acquired Brain Injury. https://pubmed.ncbi.nlm.nih.gov/41700688/

5. Lynch JH, et al. Behavioral health clinicians endorse stellate ganglion block as a valuable intervention in the treatment of trauma-related disorders. https://pubmed.ncbi.nlm.nih.gov/33727214/

6. 988 Suicide and Crisis Lifeline. https://988lifeline.org/

Disclaimer

This article is for educational purposes only and is not a substitute for individualized evaluation, diagnosis, or treatment from a qualified healthcare professional.