Executive summary
- Classic trigeminal neuralgia causes sudden, severe, brief, electric-shock-like unilateral facial pain in the trigeminal distribution, often triggered by light touch, chewing, brushing teeth, talking, or cold wind.
- This is a clinical diagnosis, but NICE CKS recommends specialist referral for MRI assessment to evaluate for a structural or secondary cause.
- First-line drug treatment in primary care is usually carbamazepine, started low and titrated carefully to effect and tolerability.
Recognising typical versus atypical disease
- Typical features: paroxysmal unilateral pain, pain-free intervals, trigger zones, and a normal neurological examination between attacks.
- Be cautious if pain is persistent rather than paroxysmal, bilateral, associated with facial numbness, hearing symptoms, abnormal oral or ear findings, or if onset is unusually young.
- Atypical features should lower your threshold for more urgent specialist input because trigeminal neuralgia is uncommon in younger adults and sensory change suggests a secondary cause.
Initial management in primary care
- Carbamazepine: CKS advises starting at 100 mg up to twice daily and titrating in steps of 100–200 mg every 2 weeks until pain is controlled or adverse effects limit escalation.
- If carbamazepine is ineffective, not tolerated, or contraindicated, seek specialist advice rather than repeatedly cycling through non-specific analgesics.
- Do not rely on standard analgesics alone: simple analgesia and typical dental-style painkillers are usually ineffective for true trigeminal neuralgia.
Frequently asked questions
What is the most helpful history clue?
A short-lasting, electric-shock facial pain triggered by otherwise trivial stimulation such as washing the face, brushing teeth, talking, or chewing is highly characteristic.
Does every patient need imaging?
NICE CKS recommends referral to a specialist for MRI assessment because secondary causes need to be considered even when the history sounds typical.
Are standard painkillers enough?
Usually not. Trigeminal neuralgia is treated as a neuropathic pain syndrome, so carbamazepine is the usual first-line medicine rather than routine simple analgesia.
Transparency
This page is an educational, clinician-written summary of publicly available NICE guidance intended for trained healthcare professionals. It uses original wording (not copied text) and should be used alongside the full NICE source, local pathways, and clinical judgement. Doses provided are for general reference; always check the BNF/SPC.