A recently published case report describes a patient with facial pain affecting both sides of the face, accompanied by tearing, nasal congestion, and swelling — a presentation that did not cleanly fit the classic pattern of trigeminal neuralgia, a nerve pain condition that is typically one-sided. Because this account is drawn from a single case report, the lowest tier of clinical evidence, its findings should be read as illustrative rather than representative. It is discussed here because it highlights a recognized diagnostic challenge: distinguishing among overlapping facial pain syndromes, and recognizing when bilateral facial pain should prompt further neurologic evaluation.
Key Points
- A single case report describes a 35-year-old woman with facial pain on both sides of the face (in the V1/V2 trigeminal nerve distributions) accompanied by tearing, facial swelling, and nasal congestion (PMID 42566723).
- Her pain responded to a combination of carbamazepine (a medication used for trigeminal neuralgia) and indomethacin (a medication used for certain headache disorders with autonomic features).
- MRI showed blood vessels touching the trigeminal nerve on both sides, but the authors judged this an incidental finding, not the cause of her pain.
- This is one case, not a clinical trial — it illustrates a diagnostic pattern clinicians should be aware of, but it does not establish how common this overlap is or how it should be treated as a rule.
What is this condition?
Facial pain isn’t a single disease — it’s a symptom with many possible causes, and identifying the underlying diagnosis determines which treatment is likely to help. Two of the relevant diagnostic categories here are:
Trigeminal neuralgia (TN) is a nerve pain disorder that produces brief, electric-shock-like pain along one or more branches of the trigeminal nerve, the nerve that carries sensation from the face. It is classically one-sided; genuinely bilateral, simultaneous TN-pattern pain is uncommon and is itself considered a possible indicator of a secondary, structural cause rather than classic (idiopathic) TN — most notably demyelinating disease such as multiple sclerosis — independent of any overlap with autonomic symptoms discussed below.
Trigeminal autonomic cephalalgias (TACs) are a separate group of headache disorders (including cluster headache) that combine pain around the eye or face with autonomic (involuntary nervous system) symptoms on the same side — tearing, eyelid drooping, nasal congestion, or redness.
The case report describes a patient whose symptoms didn’t cleanly fit either category: nerve-type pain plus autonomic features plus bilateral (both-sided) involvement, which the case report’s authors themselves note is atypical for classic TN and complicates classification. They frame this as an overlap presentation between the two categories — a reminder that some patients have features of more than one recognized pain syndrome at once, and that bilateral involvement in particular warrants its own diagnostic consideration.
How is it diagnosed?
There is no single test that confirms this kind of overlap presentation. Diagnosis relies on:
- A detailed pain history — location, quality (sharp/electric vs. throbbing), triggers, duration of attacks, and whether pain is one-sided or both-sided.
- Identifying autonomic features — tearing, nasal congestion, facial swelling, or eye redness occurring alongside the pain.
- Neuroimaging (MRI) — to look for structural causes and for neurovascular contact, meaning a blood vessel touching the trigeminal nerve near where it enters the brainstem. In this case, MRI found neurovascular contact on both sides, but the authors specifically noted this was likely incidental. Neurovascular contact is a common finding on brain MRI generally, and its presence alone does not confirm it is causing a patient’s pain.
- Response to trial treatment, cautiously interpreted — response to a specific medication can support a diagnosis, but it is not proof by itself.
Which treatment is right for me?
Treatment selection follows the working diagnosis, not the other way around. In this case, the patient’s pain responded to a combination approach:
| Feature | Trigeminal neuralgia (classic) | Trigeminal autonomic cephalalgia | This single case report (n = 1) |
|---|---|---|---|
| Typical laterality | One-sided | One-sided | Both sides |
| Pain quality | Brief, electric, shock-like | Severe, throbbing/boring | Neuropathic pain with autonomic features |
| Autonomic signs (tearing, congestion, swelling) | Usually absent | Present, same side as pain | Present, bilateral |
| First-line medication in this case | Carbamazepine | Indomethacin | Carbamazepine + indomethacin |
| MRI neurovascular contact | Often present, may be causative | Not a defining feature | Present bilaterally, judged incidental |
This table reflects the classical description of each condition alongside the specific findings in this one case report. The right-hand column reflects a single patient’s presentation, not an established diagnostic category — ICHD-3 and ICOP, the current diagnostic classification systems for headache and orofacial pain, do not currently define a formal trigeminal neuralgia–TAC overlap entity. This table is not a general treatment algorithm and should not be used to self-diagnose or to select medication without clinician evaluation.
When should I see a specialist?
Facial pain with any of the following warrants evaluation by a specialist in orofacial pain or headache medicine:
- Pain affecting both sides of the face, rather than one side
- Pain accompanied by tearing, eye redness, eyelid swelling, or nasal congestion
- Pain that hasn’t responded to standard dental or TMJ (jaw joint) treatment
- Any new, unexplained facial pain — to rule out structural or other identifiable causes before starting long-term medication
Bilateral facial pain deserves particular attention: genuinely bilateral, simultaneous trigeminal-neuralgia-pattern pain is itself a recognized indicator of a possible secondary cause — most classically multiple sclerosis or another demyelinating condition — and generally warrants neurologic evaluation and MRI, separate from the question of whether autonomic symptoms are also present.
A diagnosis that mixes features of trigeminal neuralgia and a trigeminal autonomic cephalalgia has been described only rarely in the literature, based on case-report-level evidence; how common it actually is remains unknown. Getting it right typically requires the kind of detailed history-taking, neurologic evaluation, and imaging review that a specialist orofacial pain practice or neurologist can provide.
For referring providers
This case report (PMID 42566723) documents a 35-year-old woman with bilateral V1/V2 neuropathic facial pain and ipsilateral-to-bilateral autonomic features (lacrimation, facial edema, nasal congestion), responsive to combined carbamazepine and indomethacin. Bilateral MRI neurovascular contact of the superior cerebellar artery was present but assessed as incidental rather than causative — a useful reminder given that neurovascular contact is a common finding on MRI generally. As the case report’s own limitations note, bilateral symmetric involvement is atypical for classical TN and complicates nosological classification; genuinely bilateral, simultaneous TN-pattern pain should also prompt consideration of secondary causes, most notably demyelinating disease such as multiple sclerosis, independent of the TAC-overlap question raised here. The case is instructive for the differential diagnosis of atypical, bilateral facial pain that does not cleanly satisfy criteria for either classical trigeminal neuralgia or a defined trigeminal autonomic cephalalgia, and is consistent with a rationale for combination pharmacotherapy trials in similar overlap presentations, though this approach has not been evaluated systematically. As a single case report, it carries the lowest level of evidence: it cannot establish prevalence, mechanism, or generalizable treatment efficacy, and should inform clinical suspicion rather than protocol.
References
- Pearls & Oy-sters: Bilateral Neuropathic Facial Pain With Autonomic Features and Neurovascular Contact. PMID 42566723
