Sphenopalatine Ganglion Block in St. Louis

The sphenopalatine ganglion, also called the pterygopalatine ganglion, is a small cluster of nerve cells just behind the nose. It relays feeling and automatic body signals for the face, sinuses, palate and parts of the head. So much head and face pain traffic runs through this one hub. That is why blocking it can quiet several pain patterns at once, including cluster headache and migraine.

The block can go in through the nostril. A thin catheter places numbing medicine against the lining over the ganglion. Or a needle can be used under image guidance when a deeper or longer-lasting block is needed. The transnasal (through the nose) approach takes only a few minutes. No needle goes through the skin. Patients sit up and go home soon after.

Cluster headache is the classic reason for it. The block is often used during a cluster bout to break the cycle. It is also used for refractory migraine (migraine that resists treatment), trigeminal and other facial pain, and some cases of lasting head and neck pain that medicine has not helped.

Most people feel numbness at the back of the throat and a bitter taste for a short time. The transnasal approach has no skin cut and no sedation. So most patients drive themselves home. Sometimes a series of blocks is used instead of one. It depends on the pain pattern.

The sphenopalatine ganglion is the largest parasympathetic ganglion (rest-and-repair nerve hub) of the head. It sits in the pterygopalatine fossa, a small space deep behind the nose. Only a few millimeters of lining cover it at the back of the nose. That thin cover is what lets medicine soak through from inside the nose at all.

It matters because of the trigeminal autonomic reflex. Pain signals from the trigeminal nerve (the main nerve of the face) fire a circuit in the brainstem. That circuit sends signals back out through this ganglion. They go to the blood vessels of the head and to the tear and nose glands. This reflex loop explains the autonomic (automatic body) signs that come with cluster headache and some migraine. Think tearing, a stuffy nose, a drooping eyelid and facial sweating on the painful side. Those signs are not side notes. They are the outgoing half of the reflex.

Feeling, parasympathetic and sympathetic fibers all meet in this one small hub. So blocking it cuts both the automatic output and part of the pain traffic that keeps the attack going. That is why one target works across cluster headache, some refractory migraine, and facial pain from several causes. Without that, the list would seem far too broad to believe.

It also explains the speed. Relief that starts within minutes comes from numbing a reflex loop that is firing right now. It is not a slow anti-inflammatory effect. The flip side is that how long it lasts varies a lot. Blocking a reflex does not, by itself, change whatever is driving it.