Orofacial Pain Basics
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Direct answer
Facial pain that does not fit a tooth falls into four practical groups: musculoskeletal (TMD-related), neuropathic (trigeminal and glossopharyngeal neuralgia, post-herpetic neuralgia), neurovascular (migraine, cluster headache, giant cell arteritis) and continuous idiopathic pain. Trigeminal neuralgia — unilateral, second or third division, electric shocks lasting one second to two minutes with trigger zones — is the prototype, with carbamazepine first-line. Two diagnoses are emergencies: giant cell arteritis with jaw claudication threatens sight and needs immediate high-dose steroids, and new facial numbness or rapidly progressive pain suggests malignancy.
What you must remember
- Trigeminal neuralgia per ICHD-3: recurrent unilateral paroxysms of electric facial pain lasting one second to two minutes, in the V2/V3 distribution, provoked by innocuous triggers (chewing, washing, wind), with no sensory deficit.
- Carbamazepine 100–200 mg twice daily titrated is first-line; oxcarbazepine, baclofen and lamotrigine are alternatives; a good response supports the diagnosis, and refractory cases go to microvascular decompression or radiosurgery.
- Glossopharyngeal neuralgia: lancinating throat and ear pain triggered by swallowing, coughing or yawning — the cranial nerve IX counterpart.
- Cluster headache: strictly unilateral periorbital pain of 15–180 minutes, one every second day up to eight daily, with ipsilateral lacrimation, conjunctival injection, rhinorrhoea, ptosis; treated with 100 per cent oxygen at 12–15 L/min for 15 minutes or subcutaneous sumatriptan 6 mg, verapamil for prophylaxis.
- The behavioural signature: cluster patients pace restlessly; migraine patients lie still in the dark — a favourite viva discriminator.
- Giant cell arteritis: age over 50, new temporal or scalp headache, jaw claudication (pain on chewing that eases with rest), visual symptoms; raised ESR (often markedly, above 50 mm/h) and CRP; start high-dose corticosteroids immediately — do not wait for temporal artery biopsy.
- Post-herpetic neuralgia: burning dermatomal pain after zoster, more frequent with age; treated with gabapentin or pregabalin, amitriptyline, topical lidocaine or capsaicin.
- Persistent idiopathic (atypical) facial pain: continuous, non-anatomical, often crossing the midline with a normal examination — a diagnosis of exclusion.
Telling them apart at the chairside
A dental clinician sees three patients with unilateral facial pain and a normal mouth; what separates them is the temporal and associated pattern. The first, a 58-year-old woman, describes seconds-long electric jolts into the right lower lip set off by touching the cheek; between jolts she is normal. Paroxysmal quality, trigger zones and absent sensory loss define trigeminal neuralgia; management is medical with carbamazepine, and dental treatment is contraindicated because extraction relieves nothing.
The second, a 41-year-old male smoker, has strictly left-sided pain behind the eye every night at 2 a.m. for three weeks, each attack lasting 40 minutes with a streaming eye and drooping lid, driving him to pace. Nocturnal unilateral attacks of 15–180 minutes with autonomic features define cluster headache. Acute treatment is high-flow oxygen or subcutaneous sumatriptan and prophylaxis verapamil — none of it dental, but recognition prevents a wrong diagnosis of "dental infection" and referral happens the same week.
The third, a 68-year-old woman, has right temple and jaw ache that comes on after a few minutes of chewing and eases with rest. Jaw claudication with a new headache over age 50 is giant cell arteritis until excluded: same-day referral with urgent ESR, and steroids start immediately on suspicion — delay can permanently blind. One algorithm underlies all three: when the mouth is normal, duration, periodicity, triggers and autonomic or systemic associations name the syndrome.
Where students slip
The catastrophic slip is surgical treatment of neuropathic pain — extracting healthy teeth for trigeminal neuralgia, sometimes serially, before anyone takes a proper history; the paroxysmal electric character and trigger zones must prompt medical referral, not forceps. The second is missing giant cell arteritis: jaw pain relieved by rest in an elderly patient gets labelled TMJ disorder, and the ESR is never ordered. Third is mixing cluster and migraine: duration, restlessness versus stillness, autonomic signs. Examiners also probe the "no sensory deficit" clause of trigeminal neuralgia: objective numbness argues instead for a structural lesion or malignancy and mandates imaging.
Frequently asked questions
What are the diagnostic features of trigeminal neuralgia?
Unilateral electric shock-like pain of one second to two minutes in the V2/V3 distribution, provoked by trigger zones, with no neurological deficit on examination.
Which orofacial pain is an ophthalmic emergency?
Giant cell arteritis: jaw claudication, new headache and visual symptoms over age 50 require immediate high-dose corticosteroids with urgent ESR and referral to prevent blindness.
How does cluster headache differ from migraine?
Cluster attacks last 15–180 minutes, occur up to eight times a day, are strictly unilateral periorbital with autonomic features, and make patients pace; migraine lasts 4–72 hours, is pulsating with nausea and photophobia, and makes patients lie still.
How is post-herpetic neuralgia managed?
Gabapentin or pregabalin, amitriptyline, topical lidocaine or capsaicin; early antiviral treatment of zoster reduces the risk of developing it.
Which orofacial pain features suggest malignancy rather than a benign cause?
Progressive pain, night pain, paraesthesia or numbness, weight loss, trismus without dental cause, a mass or neck node, and pain unresponsive to reasonable dental treatment all mandate imaging and biopsy.