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Headache - cluster

SNOMED: 193031009844 words•Updated 03/03/2026
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Exam Tips

  • Classic viva contrast: cluster patients are restless/agitated during attacks, whereas migraine patients often prefer to lie still in a dark room.
  • Remember timing numbers: 15-180 minutes per attack, 1 every other day to 8/day, episodic bouts with >=3-month remission, chronic if remission is <3 months or absent for >=1 year.
  • Autonomic ipsilateral features (red eye, tearing, nasal symptoms, ptosis/miosis) are key discriminators from migraine and tension-type headache.
  • First ever cluster-like bout warrants urgent specialist review and usually neuroimaging to exclude secondary causes.
  • High-flow oxygen and subcutaneous/intranasal triptans are first-line acute treatments; oral analgesics are usually ineffective due to rapid attack evolution.
  • Verapamil is first-line preventive in UK practice but requires ECG monitoring at baseline and after each dose escalation.

Definition

Cluster headache is a primary headache disorder within the trigeminal autonomic cephalalgias, characterized by recurrent attacks of excruciating unilateral orbital, supraorbital, and/or temporal pain with ipsilateral cranial autonomic features. Attacks are short (15-180 minutes), occur from once every other day up to 8 times daily, and cluster into bouts (episodic) or persist with minimal remission (chronic).

Pathophysiology

The mechanism is neurovascular and involves interaction between the hypothalamus, trigeminovascular pain pathways, and cranial parasympathetic outflow (trigeminal-autonomic reflex). Functional activation of posterior hypothalamic regions during attacks helps explain circadian timing (often nocturnal) and seasonal periodicity. Trigeminal activation drives severe unilateral pain, while parasympathetic activation causes lacrimation, conjunctival injection, and nasal symptoms; sympathetic dysfunction contributes to ptosis/miosis. Genetic susceptibility is supported by increased familial risk, with environmental triggers (for example alcohol, nitrates, volatile odours) precipitating attacks during active bouts. See figure of the trigeminal-autonomic reflex in standard neurology headache texts.

Risk Factors

  • Male sex (historically around 3:1, higher in chronic forms)
  • Age 20-40 years (typical onset window)
  • Family history of cluster headache (higher risk in first-degree relatives)
  • Smoking
  • Alcohol use (especially as a trigger during a bout)
  • Exposure to triggers such as nitrates/histamine and volatile smells (petrol, paint, perfume)

Clinical Features

Symptoms

  • At least 5 attacks of very severe unilateral orbital/supraorbital/temporal pain
  • Attack duration 15-180 minutes if untreated
  • Frequency from 1 every other day to 8 attacks/day
  • Marked restlessness or agitation during attacks (pacing/rocking, cannot keep still)
  • Nocturnal attacks, often waking the patient about 1.5-2 hours after sleep onset
  • Episodic pattern (bouts lasting weeks to months with remission) or chronic pattern (>=1 year with no remission, or remission <3 months)
  • Possible dull interictal ache in same distribution between attacks

Signs

  • Ipsilateral conjunctival injection
  • Ipsilateral lacrimation
  • Ipsilateral nasal congestion or rhinorrhoea
  • Ipsilateral eyelid oedema
  • Forehead/facial sweating or flushing
  • Ipsilateral miosis and/or ptosis (partial Horner pattern)
  • Sense of ipsilateral aural fullness

Investigations

Clinical diagnosis using ICHD-3 criteria:Typical unilateral short-lasting severe attacks with ipsilateral autonomic features and/or agitation; attack frequency and bout pattern support diagnosis
Neurology assessment (first bout or atypical presentation):Confirms primary cluster headache and identifies need for exclusion of secondary causes
MRI brain (often with pituitary/parasellar views if indicated):Usually normal in primary cluster headache; excludes structural mimics such as pituitary, cavernous sinus, or other intracranial pathology
Targeted tests for red flags (for example ESR/CRP, BP, infection work-up):Used to exclude secondary headache disorders when clinical concern exists
Headache diary:Demonstrates circadian/seasonal periodicity, attack frequency, trigger relationship, and treatment response

Management

Lifestyle Modifications

  • Urgent neurology referral for first suspected bout and any atypical features
  • Avoid alcohol during active cluster periods
  • Stop smoking and reduce exposure to volatile odours/nitrate triggers
  • Use a headache diary to track timing, triggers, and treatment effect
  • Screen for mood symptoms and suicidality; provide safety-net advice for red flags

Pharmacological Treatment

Acute abortive treatment

  • High-flow oxygen 100% via non-rebreather mask at 12-15 L/min for 15-20 minutes at attack onset
  • Sumatriptan 6 mg subcutaneous injection at onset; may repeat once after at least 1 hour (maximum 12 mg in 24 hours)
  • Zolmitriptan 5 mg intranasal spray at onset; may repeat after at least 2 hours (maximum 10 mg in 24 hours)

Avoid oral triptans for cluster attacks because onset is too slow. Triptans are contraindicated in ischaemic heart disease, previous stroke/TIA, peripheral vascular disease, and uncontrolled hypertension; use caution with serotonergic drugs. Oxygen safety: fire risk (especially smokers) and caution in severe CO2-retaining respiratory failure.

Transitional (bridge) therapy while preventive takes effect

  • Prednisolone 60 mg once daily for 5 days, then reduce by 10 mg every 2-3 days until stopped (specialist/local protocol dependent)
  • Greater occipital nerve block with corticosteroid plus local anaesthetic

Steroids are short-term only due to adverse effects (hyperglycaemia, mood change, infection risk, osteoporosis). Consider gastroprotection and glucose monitoring where relevant.

Preventive therapy (specialist-led)

  • Verapamil immediate release 80 mg three times daily initially, then titrate every 1-2 weeks according to response/tolerability (often 240-480 mg/day; sometimes higher in specialist care)
  • Lithium carbonate (for chronic cluster headache) e. g. 300 mg once to three times daily, titrated to serum level
  • Topiramate 25 mg at night, titrated gradually (commonly 50-100 mg twice daily)

Verapamil requires baseline and repeat ECGs after each dose increase due to risk of bradycardia/heart block. Lithium needs renal/thyroid monitoring and has major interactions (ACE inhibitors, diuretics, NSAIDs); avoid in pregnancy if possible. Topiramate can cause cognitive slowing, weight loss, nephrolithiasis, and is teratogenic; discuss contraception and pregnancy prevention.

Surgical / Interventional

  • Greater occipital nerve block (procedural option in specialist care)
  • Neuromodulation procedures for refractory chronic cluster headache in tertiary centres (for example occipital nerve stimulation)

Complications

  • Major quality-of-life impairment (work, education, relationships)
  • Anxiety and depressive symptoms
  • Sleep disruption and anticipatory fear of attacks
  • Suicidal ideation (important risk to assess, although attempts are uncommon)
  • Medication adverse effects (especially with steroids, verapamil, lithium, topiramate)

Prognosis

Course is variable and often lifelong, but many patients have changing patterns over time with possible longer remissions as they age. Around one quarter may experience only a single lifetime episode. Episodic and chronic forms can convert into each other over years.

Sources & References

💊BNF Drug References(3)

✅NICE Guidelines(1)

📖Textbook References(20)

  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 275)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 958, 959)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1828)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1803)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 275)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 274)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 937)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 275)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 959)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 960)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 1819)[context]
  • David Randall PhD MRCP (Editor), John Booth PhD MRCP (Editor), K - Kumar and Clark's Clinical Medicine (2025, American Elsevier Publishing Co.) - libgen.li.pdf(pp. 959, 960)[context]
  • Oxford Handbook of Clinical Diagnosis (Huw Llewelyn, Hock Aun Ang, Keir Lewis etc.) (Z-Library).pdf(pp. 490)[context]
  • Oxford Handbook of Clinical Diagnosis (Huw Llewelyn, Hock Aun Ang, Keir Lewis etc.) (Z-Library).pdf(pp. 489, 490)[context]
  • [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 887, 888)[context]
  • [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 471)[context]
  • [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 795)[context]
  • [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 472)[context]
  • [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 470, 471)[context]
  • [Oxford Medical Handbooks] Ian Wilkinson, Tim Raine, Kate Wiles, Anna Goodhart, Catriona Ha - Oxford Handbook of Clinical Medicine (2017, Oxford University Press) - libgen.li.pdf(pp. 471, 472)[context]

Sources

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