Cluster headaches and severe migraines are not simple discomfort — they are conditions that dismantle lives. If you have already been through the standard carousel of triptans, dark rooms, caffeine, and preventive medications that leave you foggy, you may be looking for something more precise. This article explains how two targeted interventional procedures, the sphenopalatine ganglion (SPG) block and the stellate ganglion block, work at the level of the nervous system — and why, at the Padda Institute, they are only the beginning of a plan.
Pain is a signal, not a diagnosis
At the Padda Institute we view pain differently. Pain is an alarm from your nervous system, your metabolism, or your structural anatomy indicating that something has drifted fundamentally out of balance. For primary headache disorders like cluster headaches and migraines, that reframing matters: the goal is not just to mute the alarm, but to find the specific relay in the nervous system that is firing — and, separately, to ask why it became hyperexcitable in the first place.
The sphenopalatine ganglion (SPG) block
The sphenopalatine ganglion is a complex bundle of nerves located deep behind the nose that acts as a major relay station for the autonomic nervous system. In cluster headaches and certain migraines, this relay becomes hyperactive — trapped in a feedback loop of pain and inflammation. By precisely delivering anesthetic to this ganglion, an interventional physician can effectively “reboot” the overactive circuit. It is a targeted strike on the neurological source of the episode rather than a vague, whole-body treatment.
Occipital nerve blocks: diagnosis and relief together
Many patients with chronic migraine also have a cervicogenic component, where the nerves at the base of the skull are compressed or inflamed. An occipital nerve block gives immediate diagnostic and therapeutic feedback: if the block relieves your pain, it confirms that these nerves are a major contributor to your pain signal. If it does not, that too is useful information, and the evaluation moves to the next layer.
Stellate ganglion blocks for a nervous system stuck in fight-or-flight
The stellate ganglion block influences the sympathetic nervous system. It is particularly relevant for patients whose headache disorders are worsened by a nervous system stuck in a permanent state of fight-or-flight. Calming that sympathetic overdrive can break the pattern that keeps the headaches recurring.
Why a block alone is not the finish line
Here is the contrarian view you will rarely hear in a typical pain clinic: much of the interventional pain industry runs on an assembly-line model of endless monthly injections, without ever asking why your nerves are hyperexcitable. If we perform an SPG block but ignore your metabolic health, we are failing you. If your insulin is chronically high, if systemic inflammation is unaddressed, or if your sleep architecture is broken, a block is merely a temporary silence of the alarm — a band-aid on a structural leak. We use the window of relief a block provides to address the underlying terrain: metabolic markers, inflammatory profile, and lifestyle.
Frequently asked questions
What is a sphenopalatine ganglion (SPG) block?
An SPG block delivers anesthetic to the sphenopalatine ganglion, a bundle of nerves behind the nose that acts as a relay station for the autonomic nervous system. In cluster headaches and some migraines this relay becomes hyperactive, and the block can interrupt that feedback loop of pain and inflammation. Individual results vary.
How is a stellate ganglion block different from an SPG block?
An SPG block targets a relay behind the nose involved in headache circuits, while a stellate ganglion block acts on the sympathetic nervous system — the fight-or-flight system. Stellate blocks are especially relevant when a headache disorder is exacerbated by a nervous system stuck in a chronic stress state. Your physician selects the procedure based on your specific presentation.
Will one nerve block cure my cluster headaches?
A block can interrupt an acute cycle and provide real relief, but on its own it is a temporary silence of the alarm. At the Padda Institute the block is used to break acute suffering and open a window to treat the underlying drivers — insulin, inflammation, and sleep. Do not start, stop, or change any prescribed headache medication on your own. Individual results vary.
Where are these procedures performed and how do I book?
Procedures are performed at the Padda Institute Center for Interventional Pain Management, 4477 Woodson Rd, Suite 100, St. Louis, MO 63134, minutes from Lambert International Airport. Book at painmd.tv/appointment/ or call (314) 481-5000.
Key takeaways
- Cluster headaches and migraines are pain signals from an overactive nervous system, not just discomfort.
- SPG and occipital nerve blocks target specific headache circuits; stellate ganglion blocks calm sympathetic overdrive.
- A targeted block is both diagnostic and therapeutic — relief helps confirm the source.
- Blocks work best as the start of a plan that also addresses metabolic health, inflammation, and sleep.
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.
Find the source of your pain — not just the signal
Padda Institute Center for Interventional Pain Management builds a customized, root-cause plan for each patient. Interventional care and metabolic medicine, under one roof in St. Louis.
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In an active cluster bout?
A sphenopalatine ganglion block takes only a few minutes, uses no needle through the skin and no sedation, and is often used during a bout to break the cycle. The Padda Institute offers same-day and emergency visits — no referral needed, and you do not need to be an existing patient. Call (314) 481-5000 or text (314) 886-5902.
Dr. Gurpreet Singh Padda, MD, MBA, MHP
