Sinus Headaches
Sinus Headaches
The term “sinus headache” is widely used but frequently misapplied. Population studies consistently show that most people who self-diagnose sinus headache — and up to 90% of patients presenting to primary care with a self-reported diagnosis of sinus headache — are actually experiencing migraine or tension-type headache. True sinus headache, caused by inflammation or obstruction of one or more paranasal sinuses, is a specific entity with well-defined features that distinguish it from primary headache disorders. Accurate diagnosis matters because the treatment of migraine and the treatment of sinusitis are entirely different, and treating migraine with antibiotics or nasal steroids will produce no benefit.
Anatomy of Sinus Pain
The paranasal sinuses — the maxillary, ethmoid, frontal, and sphenoid sinuses — are air-filled cavities within the skull bones surrounding the nasal cavity. Each sinus drains through a small opening (ostium) into the nasal cavity. When these drainage pathways become blocked — from mucosal oedema, polyps, or structural obstruction — negative pressure develops within the sinus, and accumulated secretions or pus build up. The resultant distension and inflammation of the sinus walls, which are richly innervated by branches of the trigeminal nerve, generates the characteristic facial pain of sinusitis.
Each sinus produces a characteristic pattern of pain based on its anatomical location and innervation:
True Sinus Headache vs Migraine — Key Differences
The overlap between migraine and sinusitis can be considerable — both can cause facial pain, nasal congestion, and even nasal discharge (triggered by the autonomic changes of migraine). The following features help distinguish them:
- Associated with purulent (coloured) nasal discharge or blocked nose
- Concurrent fever
- Tenderness on direct palpation of the sinus area
- Temporal relationship with a preceding cold or URTI
- Pain worsens on leaning forward or on head movement
- Confirmed by nasendoscopy or CT imaging showing sinus pathology
- Unilateral headache, often with nausea or vomiting
- Sensitivity to light (photophobia) or sound (phonophobia)
- History of recurrent similar episodes
- Normal nasal endoscopy and CT sinuses
- Triggered by hormonal changes, weather, diet, or stress
- Responds to triptans or migraine-specific treatment
- Family history of migraine
A critical clinical principle: the presence of nasal congestion with a headache does not confirm sinus headache. Migraine activates the trigemino-autonomic reflex, which causes ipsilateral nasal congestion, rhinorrhoea, and sometimes eye redness or watering — symptoms that can be mistaken for sinusitis. The clear, watery nasal discharge of a migraine-associated autonomic response is very different from the purulent discharge of acute bacterial sinusitis.
Other Causes of Facial Pain Mimicking Sinus Headache
Before attributing facial pain to the sinuses, a range of alternative diagnoses should be considered:
- Tension-type headache: Bilateral, pressing or tightening quality, mild to moderate intensity. Not aggravated by routine physical activity. The most prevalent headache disorder worldwide.
- Cluster headache: Severe unilateral periorbital or temporal pain occurring in clusters, with prominent ipsilateral autonomic features (tearing, rhinorrhoea, ptosis). Occurs in attacks lasting 15–180 minutes, typically at the same time of day.
- Trigeminal neuralgia: Brief, lancinating electrical-shock pains in the distribution of a trigeminal nerve branch (most commonly the cheek or lower face), triggered by light touch, eating, or talking.
- Dental pathology: Dental pain from periapical abscess, cracked tooth, or temporomandibular joint (TMJ) disorder can produce facial pain closely resembling maxillary sinusitis.
- Referred pain: Cervicogenic headache from neck pathology, ocular causes (glaucoma, refractive error), or referred cardiac pain should be considered in appropriate clinical contexts.
- Intracranial pathology: New, severe, or progressive headache — particularly “thunderclap” onset, early morning headache (suggesting raised intracranial pressure), or headache with neurological symptoms — requires urgent investigation to exclude subarachnoid haemorrhage, tumour, or other intracranial disease.
Assessment
The assessment of facial pain and headache attributed to the sinuses begins with a systematic history — timing, character, location, associated symptoms, triggers, and any previous investigations or treatments. A history suggesting primary headache disorder should prompt referral to a neurologist before pursuing extensive sinus investigation.
Key investigations include:
- Nasal endoscopy: Essential. Direct visualisation of the nasal passages and sinus drainage pathways can identify mucosal oedema, purulent discharge, nasal polyps, or other pathology. A normal endoscopy in a patient with facial pain makes sinus pathology much less likely and should redirect the diagnostic workup.
- CT sinuses: The definitive imaging investigation for sinus disease. Must be performed when the patient is at a stable baseline — not during an acute exacerbation. Opacification on CT during an acute episode may not represent the true chronic baseline state. A completely normal CT in a patient with chronic facial pain effectively excludes the sinuses as the cause.
- Allergy testing: Where allergic rhinitis is suspected as a contributing factor.
Treatment
Treatment is directed at the confirmed underlying cause. Where sinus pathology is confirmed on endoscopy and CT, management follows the principles described in the sinusitis and chronic rhinosinusitis pages — medical treatment first, with surgery reserved for failure of adequate medical therapy.
Where investigations are normal and a primary headache disorder is likely, management should be redirected toward appropriate neurological assessment and headache-specific treatment. Prescribing antibiotics or nasal steroids for confirmed migraine is not effective and exposes patients to unnecessary medication side effects.
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Dr Roth’s Clinical Perspective
The term “sinus headache” is used by patients to describe almost any headache in the frontal or mid-facial region, but the majority of these are migraine or tension headache rather than true sinus disease. The critical diagnostic question is whether the headache is accompanied by other sinus symptoms — nasal obstruction, mucopurulent discharge, reduced smell — because sinusitis very rarely presents with pain alone. A CT scan showing minor mucosal thickening in the context of an isolated headache is a non-specific finding and does not confirm that the headache is sinus-related. Treating migraine as sinusitis — which is common — produces no benefit and delays the correct diagnosis.
— Dr Jason Roth, MBBS, FRACS (ORL-HNS), IBCFPRS
Specialist Otolaryngologist & Head and Neck Surgeon
Specialist registration — Otorhinolaryngology, Head & Neck Surgery
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