Patient Guide · Trigeminal neuralgia
Trigeminal Neuralgia — An Update
Trigeminal neuralgia is a disorder of the fifth cranial nerve that causes episodes of severe, stabbing facial pain. It has been described as one of the most painful conditions known — and it is treatable.
The experience
What it feels like
Electric-shock-like
Patients describe it as a sudden jolt — like a live wire touching the face. This quality is so distinctive that it often makes the diagnosis before any scan.
Sudden and intense
The pain arrives without warning, reaching peak intensity almost instantaneously. It is among the most severe pain syndromes known to medicine.
Brief duration
Each paroxysm lasts from a few seconds to two minutes. Attacks may occur in clusters, with many episodes close together over hours or days.
Triggered by touch
Light stimulation — brushing teeth, shaving, a breeze on the face, speaking, or chewing — can provoke an attack. This leads to avoidance behaviours that affect daily life.
Classification
The three types
Classical
A blood vessel — most commonly the superior cerebellar artery — compresses the trigeminal nerve root, leading to morphological changes such as demyelination. This is the most common and the most treatable form.
Secondary
The pain is caused by another identifiable condition: multiple sclerosis, a tumour, a cyst, or an arteriovenous malformation. Treating the underlying cause is the priority.
Idiopathic
The clinical picture is convincing for trigeminal neuralgia, but no structural cause is found on high-resolution imaging. These cases are managed similarly to the classical type.
Knowing which type you have determines which treatment is most likely to help.
Making the diagnosis
How it's diagnosed
Clinical diagnosis
The history is more important than any scan. The hallmark features — paroxysmal, triggered, electric-shock-like pain confined to one or more divisions of the trigeminal nerve — make the diagnosis.
A normal neurological examination between attacks supports the diagnosis. Sensory loss or other cranial nerve signs should raise suspicion of a secondary cause.
MRI
A dedicated trigeminal nerve protocol is essential — a routine brain MRI is not sufficient. The protocol includes high-resolution T2-weighted sequences such as CISS or FIESTA to visualise the nerve and any compressing vessel.
Magnetic resonance angiography (MRA) and contrast-enhanced T1-weighted images complete the study, helping to exclude tumours, MS plaques, or vascular malformations.
Your options
Treatment ladder
Medications
Carbamazepine or oxcarbazepine are first-line treatments. Start at a low dose and titrate slowly to find the lowest effective dose that controls your pain. Regular blood monitoring is required — your doctor will explain why.
Percutaneous procedures
Radiofrequency rhizotomy, balloon compression, or glycerol injection. Performed through a needle under sedation, these offer rapid pain relief and are particularly useful for frail or elderly patients who may not tolerate open surgery.
Gamma Knife radiosurgery
Focused radiation delivered to the trigeminal nerve root. No incision, a day procedure, with pain relief developing over weeks. Particularly valuable for patients who cannot undergo microvascular decompression.
Microvascular decompression
The only treatment that addresses the cause in classical TN. A small craniotomy behind the ear allows the surgeon to separate the compressing vessel from the nerve, with the highest chance of durable relief and preservation of facial sensation.
What to remember
Key clinical pearls
- 1The history is more important than the scan — the hallmark paroxysmal, triggered, electric-shock pain points to the diagnosis before imaging confirms it.
- 2A dedicated MRI protocol with thin-slice T2, CISS, or FIESTA sequences is essential — a routine brain MRI is insufficient and may miss a compressing vessel.
- 3Carbamazepine responsiveness is so characteristic that a lack of response should prompt reconsideration of the diagnosis.
- 4The natural history is one of remissions and relapses — treatment is about controlling episodes rather than curing the condition.
- 5Microvascular decompression offers the best chance of long-term pain freedom in classical TN, but the decision requires careful consideration of operative risks and patient fitness.
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