Classification of headache as per Ichd 3 ( Ent)
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ICHD-3 headache classification ENT otolaryngology rhinogenic sinusitis
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Now I have comprehensive information from the textbooks. Let me compile the complete ICHD-3 classification with the ENT-relevant portions highlighted.
ICHD-3 Classification of Headache — ENT Perspective
The International Classification of Headache Disorders, 3rd edition (ICHD-3), published by the International Headache Society in 2018 (Cephalalgia 38:1–211), organizes all headaches into 4 Parts and 14 groups.
PART ONE: Primary Headaches (Groups 1–4)
These occur without underlying structural disease.
1. Migraine
| Code | Subtype |
|---|---|
| 1.1 | Migraine without aura |
| 1.2 | Migraine with aura |
| 1.2.1 | Migraine with typical aura |
| 1.2.1.1 | Typical aura with headache |
| 1.2.1.2 | Typical aura without headache |
| 1.2.2 | Migraine with brainstem aura |
| 1.2.3 | Hemiplegic migraine (familial & sporadic) |
| 1.2.4 | Retinal migraine |
| 1.3 | Chronic migraine (≥15 days/month) |
| 1.4 | Complications of migraine (status migrainosus, persistent aura, migrainous infarction, aura-triggered seizure) |
| 1.5 | Probable migraine |
| 1.6 | Episodic syndromes associated with migraine (cyclical vomiting, abdominal migraine, benign paroxysmal vertigo, benign paroxysmal torticollis) |
⚠️ ENT relevance: Benign paroxysmal vertigo (1.6.2) falls under migraine. Critically, most "sinus headaches" are actually migraine — patients have cranial autonomic symptoms, facial involvement, and weather/seasonal triggers that mimic sinusitis. Studies show >90% of self-diagnosed "sinus headaches" meet migraine criteria.
2. Tension-Type Headache (TTH)
| Code | Subtype |
|---|---|
| 2.1 | Infrequent episodic TTH |
| 2.2 | Frequent episodic TTH |
| 2.3 | Chronic TTH |
| 2.4 | Probable TTH |
3. Trigeminal Autonomic Cephalalgias (TACs)
| Code | Subtype |
|---|---|
| 3.1 | Cluster headache (episodic & chronic) |
| 3.2 | Paroxysmal hemicrania (episodic & chronic) |
| 3.3 | Short-lasting unilateral neuralgiform headache attacks (SUNA/SUNCT) |
| 3.4 | Hemicrania continua |
| 3.5 | Probable TAC |
⚠️ ENT relevance: TACs mimic ENT disorders — cluster headache causes unilateral periorbital pain with ipsilateral lacrimation, rhinorrhoea, and nasal congestion, frequently misdiagnosed as sinusitis or allergic rhinitis.
4. Other Primary Headache Disorders
Includes primary cough headache, primary exercise headache, primary thunderclap headache, cold-stimulus headache, hypnic headache, new daily persistent headache, etc.
PART TWO: Secondary Headaches (Groups 5–12)
Head pain is a symptom of an underlying disease.
5. Headache attributed to trauma/injury to head or neck
Post-traumatic, post-craniotomy, etc.
6. Headache attributed to cranial/cervical vascular disorder
Stroke, TIA, unruptured aneurysm, AVM, giant cell arteritis, etc.
7. Headache attributed to nonvascular intracranial disorder
Raised ICP, low CSF pressure, intracranial neoplasm, etc.
8. Headache attributed to substance or its withdrawal
Medication overuse headache (MOH), alcohol, caffeine, opioid withdrawal, etc.
9. Headache attributed to infection
Meningitis, encephalitis, systemic infection.
10. Headache attributed to disorder of homeostasis
Hypertension, hypothyroidism, hypoxia, cardiac cephalalgia (exertional headache from myocardial ischemia — relieved by nitroglycerine, important >50 years).
⭐ 11. Headache or Facial Pain Attributed to Disorder of the Cranium, Neck, Eyes, Ears, Nose, Sinuses, Teeth, Mouth, or Other Facial/Cervical Structure
This is the most ENT-relevant group.
| Subgroup | Condition |
|---|---|
| 11.1 | Headache attributed to disorder of cranial bone |
| 11.2 | Cervicogenic headache — from cervical spine pathology; pain referred to head/face |
| 11.3 | Headache attributed to disorder of eyes (acute angle-closure glaucoma, refractive error in hyperopic children, trochleitis) |
| 11.4 | Headache attributed to disorder of ears |
| 11.5 | Headache attributed to rhinosinusitis |
| 11.5.1 | Headache attributed to acute rhinosinusitis — purulent discharge, fever; location depends on sinus: maxillary → cheek pain; frontal → frontal pain; sphenoid/ethmoid → pain between/behind eyes, vertex referral; worse on bending forward |
| 11.5.2 | Headache attributed to chronic or recurring rhinosinusitis — most closely resembles chronic tension-type headache |
| 11.6 | Headache attributed to disorder of teeth, jaws, or related structures (TMJ, pulpitis, cracked tooth syndrome) |
| 11.7 | Headache attributed to TMJ disorders (Costen syndrome) |
| 11.8 | Head/facial pain attributed to inflammation of stylohyoid ligament (Eagle syndrome) |
| 11.9 | Other headache from facial/cranial structures |
Key ENT conditions under Group 11:
- Acute sinusitis headache: characteristic of purulent rhinosinusitis; confirmed by radiological evidence of acute sinusitis; resolves within 7 days of remission of sinusitis
- Sphenoid sinusitis: especially dangerous — proximity to cavernous sinus; can cause intracranial complications
- Nasopharyngeal malignancy: deep-seated facial/head pain, trigeminal sensory loss (perineural spread); MRI is optimal for detection
- Ear disorders: otitis media, otitis externa, referred otalgia from pharynx/larynx/cervical spine
- Cervicogenic headache: cervical spondylosis as pain generator; requires clinical/diagnostic block confirmation
12. Headache attributed to psychiatric disorder
PART THREE: Painful Cranial Neuropathies, Other Facial Pain & Other Headaches (Groups 13–14)
⭐ 13. Painful Lesions of Cranial Nerves and Other Facial Pain
Highly relevant to ENT:
| Code | Condition |
|---|---|
| 13.1 | Trigeminal neuralgia (classical — vascular compression; secondary; idiopathic) |
| 13.2 | Glossopharyngeal neuralgia |
| 13.3 | Nervus intermedius (facial nerve) neuralgia |
| 13.4 | Occipital neuralgia |
| 13.5 | Optic neuritis headache |
| 13.6 | Headache attributed to ischemic ocular motor nerve palsy |
| 13.7 | Tolosa-Hunt syndrome |
| 13.8 | Paratrigeminal oculosympathetic (Raeder) syndrome |
| 13.9 | Painful ophthalmoplegia — recurrent |
| 13.10 | Burning mouth syndrome |
| 13.11 | Persistent idiopathic facial pain (PIFP) |
| 13.12 | Central neuropathic pain (post-stroke, MS-related trigeminal pain) |
14. Other Headache Disorders
PART FOUR: Appendix
Contains research criteria for entities not yet fully validated — may be incorporated in future ICHD revisions.
Summary Table: ENT-Relevant ICHD-3 Diagnoses
| ICHD-3 Group | ENT Condition |
|---|---|
| 1.6.2 | Benign paroxysmal vertigo (migraine-associated) |
| 3.1–3.4 | TACs (mimic sinusitis/rhinitis) |
| 11.4 | Ear disorder headache |
| 11.5.1 | Acute rhinosinusitis headache |
| 11.5.2 | Chronic rhinosinusitis headache |
| 11.6–11.7 | TMJ/dental headache |
| 11.8 | Eagle syndrome |
| 13.1 | Trigeminal neuralgia |
| 13.2 | Glossopharyngeal neuralgia |
| 13.3 | Nervus intermedius neuralgia |
| 13.4 | Occipital neuralgia |
| 13.10 | Burning mouth syndrome |
| 13.11 | Persistent idiopathic facial pain |
Key clinical pearls for ENT:
- Rhinosinusitis headache requires both clinical evidence of acute sinusitis AND headache causally related — not merely co-occurring congestion
- Most "sinus headaches" presenting to ENT clinics are actually migraine and should be treated accordingly
- Sphenoid sinusitis headache can simulate intracranial pathology and carries risk of cavernous sinus involvement
- Nasopharyngeal/sinus malignancy presents with deep-seated pain + trigeminal sensory loss — MRI is the investigation of choice
Sources: Bradley and Daroff's Neurology in Clinical Practice; Harrison's Principles of Internal Medicine 22E; Rosen's Emergency Medicine — all citing ICHD-3, Cephalalgia 2018;38:1–211
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