Giant cell arteritis presenting as facial or jaw pain is the most important vascular emergency in this differential — jaw claudication (pain on chewing that resolves with rest) is a specific ischaemic symptom of GCA, caused by ischaemia of the masseter and temporalis muscles from external carotid artery vasculitis. The medicolegal principle: a GP who attributes jaw pain in an elderly patient to 'dental' or 'TMJ' causes without checking ESR and CRP, and the patient subsequently develops GCA-related anterior ischaemic optic neuropathy with permanent blindness, faces a significant medicolegal claim. Prednisolone 40–60 mg (60 mg with ischaemic symptoms such as jaw claudication or visual symptoms) must be started immediately on clinical suspicion — before ultrasound or biopsy results are available. Normal inflammatory markers do not exclude GCA (NG127). Carotid artery dissection can present with ipsilateral facial pain (from pressure on sensory nerves around the internal carotid artery) plus Horner syndrome — this triad (facial pain + ipsilateral Horner + neck pain) is diagnostic until proved otherwise and is a 999 emergency.

Trigeminal neuralgia is one of the most severe pain conditions in clinical medicine — patients describe it as electric shock, lightning bolt, or hot poker applied to the face, lasting only seconds but occurring up to hundreds of times per day. The International Headache Society classification distinguishes classical TN (caused by neurovascular compression of the trigeminal nerve root — typically by the superior cerebellar artery), secondary TN (caused by MS, tumour, or AVM), and idiopathic TN (no cause found on MRI). In primary care, the key diagnostic features are: the paroxysmal quality (seconds, strictly not constant), the trigger phenomenon (light touch — toothbrushing, eating, cold air), the strict unilateral distribution, and the absence of objective sensory deficit between attacks. Any patient with features suggesting TN and objective sensory loss (numbness between attacks) needs urgent neuroimaging (NG127). Arrange or request MRI through the local neurology/ENT pathway, particularly for first presentation, atypical features, abnormal neurological findings, age under 40, bilateral TN or poor response to treatment, using a high-resolution trigeminal nerve protocol where available (EAN 2019).

The dental percussion test is one of the most clinically useful bedside investigations for facial pain in the orofacial region — gentle tapping on the crown of each upper or lower tooth with a metal object (pen top, dental mirror handle) identifies the specific tooth with periapical infection or pulpitis when the patient has jaw pain that cannot be clearly localised. The test is positive when the percussed tooth is significantly more painful than adjacent teeth. Combined with the cold test (ethyl chloride spray or ice applied briefly to the tooth — prolonged lingering pain beyond 30 seconds indicates irreversible pulpitis; no response indicates pulp necrosis suggesting periapical pathology), these two examinations identify dental causes in the majority of orofacial pain presentations. GPs should be confident performing these tests — they allow appropriate triage to emergency dental services and guide antibiotic prescribing when emergency dental access is unavailable. Document which tooth is affected and the clinical findings to facilitate handover to the dentist.

The cluster headache oxygen treatment is frequently not prescribed or available in primary care — subcutaneous sumatriptan is a fast-acting acute treatment, and high-flow 100% oxygen (at least 12 L/min via a non-rebreathing mask with reservoir bag) is an effective alternative with no systemic side effects. NICE CG150 (headaches) recommends offering oxygen and/or a subcutaneous or nasal triptan for acute cluster headache, with home and ambulatory oxygen arranged where oxygen is used. In practice, oxygen prescribing for cluster headache is frequently not done in primary care — the GP needs to write an oxygen prescription (via a Home Oxygen Order Form to the regional home oxygen supplier) specifying: cluster headache, 100% O₂ at at least 12 L/min, non-rebreathing mask with reservoir bag, home and ambulatory supply. This should be done at the time of diagnosis to allow the patient to treat attacks at home, avoiding repeated A&E attendances.

Nasopharyngeal carcinoma is a rare but important suspected head and neck cancer diagnosis that can present primarily as facial pain or numbness — it arises from the nasopharyngeal epithelium with strong EBV association and highest prevalence in Chinese, Southeast Asian, and North African populations. The triad: unilateral facial numbness (V2 distribution — maxillary nerve compression from skull base involvement), bloody nasal discharge or unilateral nasal obstruction, and unilateral upper cervical lymphadenopathy (cervical metastasis is common at diagnosis). NPC is radiosensitive and chemosensitive, and outcomes are better when it is diagnosed early. GPs should maintain a low threshold for an urgent ENT / head and neck referral in any patient of Chinese or Southeast Asian heritage with unexplained unilateral nasal symptoms, facial numbness, or cervical lymphadenopathy. NICE NG12 (updated April 2026) has no nasopharyngeal-specific criterion — its head and neck recommendations (for example, an unexplained neck lump aged 45 and over) apply where they are met (then use the suspected cancer pathway referral); otherwise, clinical judgement supports an urgent ENT referral through the local pathway.

Response to carbamazepine is not sufficiently specific to confirm a TN diagnosis and may falsely reinforce an incorrect diagnosis — continue to look for atypical features and arrange MRI through the local pathway. The mechanism: carbamazepine blocks voltage-gated sodium channels in the trigeminal nerve, suppressing the ectopic firing that generates the paroxysmal pain. Key prescribing pitfalls: (1) always start at 100 mg once or twice daily and titrate slowly — starting too high causes nausea, dizziness, and diplopia that leads to unnecessary drug discontinuation; (2) check sodium after about 2 weeks and monthly for the first 3 months in those at increased risk (older adults, CKD, diuretics); (3) test HLA-B*1502 before prescribing in people of Han Chinese or Thai ancestry (consider in other relevant Southeast Asian groups) — the allele is strongly associated with carbamazepine-related SJS/TEN (MHRA); (4) routine six-monthly carbamazepine levels are not required.

Combined paracetamol and ibuprofen is commonly more effective than either alone for acute dental pain (Moore et al., 2015, Cochrane Oral Health Group) where an NSAID is safe — check pregnancy, CKD, peptic ulcer disease, anticoagulation and cardiovascular risk, and the maximum paracetamol dose. Antibiotics do not treat dental pain and are reserved for spreading infection, systemic illness, significant trismus, high-risk immunocompromise or when immediate dental treatment is unavailable with risk of progression. This combination should be the first-line recommendation for dental pain awaiting treatment — prescribed as a regular (not PRN) schedule: paracetamol 1g every 6 hours + ibuprofen 400 mg every 8 hours (with food). The regular scheduling maintains plasma levels and prevents pain peaks, which is far more effective than taking analgesics after pain has re-emerged. This approach avoids unnecessary opioid prescribing for dental pain while the patient is directed to a dentist or the NHS 111 dental pathway.

The cluster headache home oxygen prescription is one of the most impactful but most frequently omitted interventions in UK primary care — patients with cluster headache typically attend A&E repeatedly during each cluster period because they have no effective treatment at home. High-flow oxygen (100% O₂ at at least 12 L/min via a non-rebreathing mask with reservoir bag) is effective for many cluster headache attacks and has no systemic side effects or drug interactions. NICE CG150 recommends offering oxygen, with home and ambulatory oxygen arranged. The oxygen is prescribed via the NHS Home Oxygen Service (Home Oxygen Order Form, available on NHS England website) specifying: indication (cluster headache), flow rate (at least 12 L/min), interface (non-rebreathing mask with reservoir bag), and that it is for acute use only (not continuous). Combined with a subcutaneous or nasal triptan, these treatments reduce the need for cluster headache A&E attendances.

The safety-netting message for all patients aged 50 and over presenting with facial pain must include explicit GCA warning signs — even if GCA has been clinically excluded at the consultation, the safety-netting statement is essential: 'Because of your age, I want you to know that if you develop pain in your jaw on chewing that stops with rest, new temporal headache, scalp tenderness, or any sudden visual change in one eye, you should go to A&E immediately — do not wait for a GP appointment.' Document this safety-netting in the clinical record. Visual loss from GCA is permanent and can occur within hours — the safety-netting conversation and documentation takes 60 seconds and can preserve a patient's vision for decades. Where GCA is considered, document the reasoning, any ESR and CRP results (remembering that normal results do not exclude GCA) and the safety-net given.