Health condition · Clinically reviewed
Trigeminal neuralgia, sudden shock-like facial pain — modern medical and surgical care.
Severe, electric-shock facial pain triggered by touching a specific area. Carbamazepine is first-line; MRI can identify vascular compression; microvascular decompression cures many patients.
Why trust this guide
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Clinically reviewed
Written by our editorial team and reviewed by a registered UK clinician before publication.
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Sourced from guidance
Every claim is checked against NICE, EAN or peer-reviewed sources you can see at the end.
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Updated for 2026
Reflects current UK practice — carbamazepine, MRI with 3D-CISS, and microvascular decompression.
Key facts
Trigeminal neuralgia at a glance.
The essentials, in plain English — what it is, how it is diagnosed, and how it is treated in the UK today.
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What it is
Paroxysmal, shock-like facial pain in the territory of the trigeminal nerve, usually one-sided.
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Classic vs secondary
Classic TN is caused by vascular compression of the nerve; secondary TN follows MS or a tumour.
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First-line drug
Carbamazepine relieves pain in roughly 80% of patients and remains the medical mainstay.
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Imaging
MRI of the brain with a 3D-CISS sequence rules out MS and tumour and shows vascular contact.
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Surgical cure
Microvascular decompression is curative in many patients with classic TN.
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Other procedures
Percutaneous ablation and gamma knife stereotactic radiosurgery are established alternatives.
Why this guide matters
The right diagnosis changes everything.
TN is often confused with dental pain. Getting to the correct diagnosis — and the correct treatment — early can spare months of unnecessary suffering.
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Carbamazepine works for most
About 80% of patients respond to the first-line drug — but it needs monitoring on treatment.
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MRI answers the key question
A 3D-CISS sequence shows vascular compression and rules out MS or a tumour behind the pain.
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Surgery can be curative
Microvascular decompression offers long-lasting relief in many patients with classic TN.
How the diagnosis is made
From first attacks to a clear plan.
The steps a UK GP and specialist will normally follow, in order — so you know what to expect and why.
Phase 1 · Recognising
Spotting the pattern and examining the nerves
Phase 2 · Confirming
Imaging and bloods to guide treatment
Phase 3 · Managing
Medical treatment and surgical options
- 01
Recognising
The symptom pattern
Paroxysmal, unilateral, electric-shock pain triggered by touch, chewing or talking in a trigeminal branch.
- 02
Recognising
Neurological examination
A careful cranial-nerve exam looks for sensory loss, motor signs or other clues to a secondary cause.
- 03
Recognising
MRI brain with 3D-CISS
A high-resolution MRI sequence shows the trigeminal root and any vessel in contact with it.
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Confirming
Rule out MS or tumour
Imaging is reviewed for demyelinating plaques, cerebellopontine-angle tumours or other secondary causes.
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Confirming
Baseline bloods
FBC, U&E and LFTs before starting carbamazepine — the drug needs monitoring on treatment.
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Managing
Neurology / neurosurgery
Referral for specialist review when medical treatment fails or a surgical option is being considered.
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Managing
Medical vs surgical plan
A shared decision — continue drugs, decompress the nerve, ablate it percutaneously, or use gamma knife.
Typical timeline: 4–8 weeks from first appointment to a settled plan.
Symptoms
What trigeminal neuralgia actually feels like.
Sudden, shock-like pain in the face — triggered by small everyday movements. Here is the pattern that distinguishes TN from dental or other facial pain.
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Shock-like paroxysms
Sudden, brief, electric-shock pain lasting seconds — often in clusters.
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Touch-triggered
A light breeze, shaving, washing or brushing teeth can set off an attack.
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Chewing or talking triggers
Eating and speaking commonly provoke pain — some people lose weight because of it.
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Trigeminal distribution
Pain in V2 (cheek) or V3 (jaw) most often; V1 (forehead) is less common.
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Unilateral typically
Almost always one-sided — new bilateral pain suggests a secondary cause.
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Secondary to MS
Multiple sclerosis can cause TN, especially in patients under 40 or with bilateral pain.
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Secondary to tumour
A tumour at the cerebellopontine angle can compress the trigeminal nerve and mimic classic TN.
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Red flag: deficits
Sensory loss or motor signs need urgent neurology review — a secondary cause is likely.
Treatment
How trigeminal neuralgia is treated in the UK.
Medical treatment with carbamazepine first — and, when that is not enough, a range of surgical and procedural options.
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Carbamazepine (first-line)
The mainstay drug — relieves shock-like pain in about 80% of patients when started at low dose and titrated.
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Oxcarbazepine
A closely related option with a gentler side-effect profile — often used when carbamazepine is not tolerated.
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Lamotrigine (add-on)
Used as an adjuvant when a single drug is not enough — slow titration to avoid rash.
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Baclofen
A muscle relaxant with a role in TN, particularly in patients with MS-related pain.
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Gabapentin (adjuvant)
Sometimes added for background or breakthrough pain when other drugs are limited.
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Microvascular decompression
A neurosurgical operation that lifts the offending vessel off the nerve — curative in many patients with classic TN.
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Gamma knife stereotactic radiosurgery
A focused, non-invasive radiation option — pain relief typically develops over weeks.
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Percutaneous procedures
Glycerol injection, balloon compression or radiofrequency lesioning of the trigeminal ganglion.
What this guide is based on
The sources behind every claim on this page.
UK national guidance and specialist society standards, current at the time of last review.
Key references
Guidelines and standards we relied on.
A quiet reminder
This guide is for information, not medical advice.
Your GP or neurologist knows your history and can tell you which parts apply to you. If in doubt, seek assessment — especially with any red-flag features.
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NICE. Neuropathic pain in adults: pharmacological management (CG173).
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European Academy of Neurology. Guideline on trigeminal neuralgia.
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International Headache Society. ICHD-3 diagnostic criteria.
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Trigeminal Neuralgia Association UK.
Red flags
When facial pain needs urgent review.
These features point away from classic TN and toward a secondary cause — see a specialist promptly.
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Sensory or motor deficit
Numbness or weakness in the face suggests a secondary cause — urgent neurology review.
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New bilateral trigeminal pain
Pain on both sides is uncommon in classic TN and points to MS or another cause.
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Age under 40
Younger patients are more likely to have MS-related TN — imaging is important.
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Systemic symptoms
Weight loss, fevers or malaise with facial pain need broader assessment.
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Post-surgical numbness
Persistent numbness or anaesthesia dolorosa after ablation or surgery requires specialist review.
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Failed medical therapy
When carbamazepine and add-ons stop controlling pain, refer for surgical options.
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Cluster-tic overlap
Autonomic features (tearing, nasal blockage) alongside TN can indicate an overlap syndrome.
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Facial weakness
A drooping or weak face alongside pain is a red flag for a structural lesion.
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Vision change
New visual symptoms with facial pain need same-day assessment.
Living with it
A serious condition, but a treatable one.
Four things that make the biggest difference day to day — knowing your triggers, titrating drugs carefully, keeping up bloods, and not waiting too long on surgery.
A quiet reminder
You do not have to accept the pain as ‘just how it is’.
When drugs stop working, a specialist can offer surgery or a targeted procedure that changes the trajectory.
- 01 Triggers
Learn your trigger points
Small daily adjustments — how you shave, brush teeth or eat — can reduce attack frequency.
- 02 Titration
Start low, go slow with carbamazepine
Gradual dose increases reduce dizziness and drowsiness and improve tolerance.
- 03 Monitoring
Blood tests matter on treatment
Sodium, liver function and blood count are checked periodically while on carbamazepine.
- 04 Surgery
Do not wait too long to consider surgery
Microvascular decompression works best in classic TN — a specialist can advise on timing.
Frequently asked
Everything we get asked about trigeminal neuralgia.
Quick answers on MRI, carbamazepine, microvascular decompression, gamma knife and when to see a specialist.
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What is trigeminal neuralgia?
A condition of the trigeminal nerve that causes sudden, severe, electric-shock pain in the face — usually one-sided and triggered by touching a specific area.
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Do I need an MRI?
Yes. An MRI of the brain — ideally with a 3D-CISS sequence — is used to rule out multiple sclerosis and tumours and to see whether a blood vessel is compressing the nerve.
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What is the first-line drug?
Carbamazepine. It relieves pain in about 80% of patients with classic trigeminal neuralgia and is started at a low dose and titrated up gradually.
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What is microvascular decompression?
A neurosurgical operation in which the artery pressing on the trigeminal nerve is gently lifted away. In classic TN it offers long-lasting relief and is curative in many patients.
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What are the alternatives to surgery?
Gamma knife stereotactic radiosurgery and percutaneous procedures — glycerol injection, balloon compression, or radiofrequency lesioning — are established alternatives when open surgery is not suitable.
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When should I be referred to a specialist?
If medical treatment fails to control pain, if the pain has red-flag features (bilateral, sensory or motor loss, under 40), or if you are considering a procedure — ask your GP for a neurology or neurosurgery referral.
Related content
Keep reading.
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Brain MRI
The scan used to identify vascular compression and rule out secondary causes.
Learn more -
Blood tests
Baseline bloods before starting carbamazepine — and monitoring on treatment.
Learn more -
Cognitive assessment (MoCA)
A short bedside test of memory and thinking.
Learn more -
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