Cluster headache specialist in Sydney

Cluster headache is a primary headache disorder — the brain itself, not a structural problem in the head, is generating the pain.

The name comes from the way attacks group together: short, severe attacks of one-sided pain that come in clusters — daily or several times a day, often for weeks or months — and then stop, sometimes for years. It is one of a small family of conditions called the trigeminal autonomic cephalalgiastrigeminal autonomic cephalalgias (TACs)A group of primary headache disorders sharing strictly one-sided head pain in the territory of the trigeminal nerve, accompanied by ipsilateral autonomic features (red eye, tearing, nasal congestion, eyelid changes). Cluster headache is the most common; the rarer members are paroxysmal hemicrania, hemicrania continua and SUNCT/SUNA. Defined by the International Classification of Headache Disorders, 3rd edition (ICHD-3). — pain disorders that share the same fingerprint of severe one-sided pain plus autonomic features (red eye, watery eye, blocked nostril) on the same side as the pain.

Two clinically important categories drive almost every treatment decision:

• Episodic cluster headache — attacks come in bouts lasting a week to a year, with remission periods of three months or more between bouts. The majority of cluster-headache patients sit here. Bouts often have a seasonal rhythm; a patient may have a two-month bout every spring, or every other November, for years.
• Chronic cluster headache — attacks continue without remission for more than a year, or with remission periods shorter than three months. Less common, harder to treat, and the form most likely to need long-term preventive therapy.

Patients sometimes shift between the two forms over time. A long history of episodic cluster headache can convert to chronic; chronic cluster headache can also revert to episodic, particularly on effective preventive treatment.

You may have come across cluster headache called “suicide headache” — a colloquial name reflecting both the pain’s reputation as one of the most severe in human medicine, and the suicidal ideation documented in patients during the worst bouts. We mention this not to alarm, but to acknowledge: if your pain feels that bad, you are not exaggerating. The right plan changes this dramatically.

The cluster-headache attack has a recognisable signature. Patients and partners learn the pattern quickly, which is one reason a well-taken history is the most powerful diagnostic tool we have.

The pain itself

• Strictly one-sided, almost always around or behind one eye, the temple, or the forehead. Within a bout the side rarely changes. Across a lifetime, some patients do switch sides between bouts.
• Very severe — routinely described as sharper, more piercing or boring than migraine. Patients often say it feels like a hot poker, an ice pick or a drill behind the eye.
• Builds quickly — from nothing to peak intensity within five to ten minutes, occasionally faster.
• Lasts 15 minutes to three hours untreated. Effective acute treatment shortens this dramatically, often to under 15 minutes.

The autonomic features — on the same side as the pain

These are the clinical fingerprint that separates cluster headache (and the other TACs) from migraine. Under ICHD-3 the diagnosis requires either at least one of these ipsilateral autonomic features, or a sense of restlessness or agitation during attacks (see below) — in practice most patients have several autonomic features as well as the restlessness. All occur on the painful side:

• Red eye (conjunctival injectionconjunctival injectionVisible redness of the white of the eye, caused by dilation of small blood vessels on the surface of the eye. In cluster headache it is on the same side as the pain and resolves with the attack.) and watering of the eye (lacrimation)
• Blocked or running nostril
• Drooping eyelid (ptosisptosisDrooping of the upper eyelid. In cluster headache, partial ptosis on the side of the pain is common during attacks and usually resolves between attacks. Reflects activation of the sympathetic nervous system on that side, sometimes called a partial Horner syndrome.) or eyelid swelling
• Pupil constrictionmiosisConstriction of the pupil so that it appears smaller than the other side. Like ptosis, it reflects sympathetic activation and is often seen on the painful side during a cluster-headache attack. (a smaller pupil on the painful side)
• Forehead and facial sweating or flushing on the painful side
• A sense of fullness in the ear on the painful side

Restlessness — the migraine discriminator

Almost all patients with cluster headache become restless and agitated during an attack. They pace, rock, can’t sit still; some bang their head, hold ice to the eye, splash cold water on their face. This is the opposite of migraine, where the patient retreats to a dark, quiet room and lies still. If you have ever wondered whether what you have is “a really bad migraine” or something different, this single feature is one of the strongest clues.

Timing within a bout

• Many patients have regular night attacks, often an hour or two after falling asleep, sometimes around the same clock time night after night
• Daytime attacks frequently cluster around the same hour each day
• Frequency within a bout ranges from one attack every other day to eight a day per ICHD-3 diagnostic criteria

Cluster headache vs migraine

Many cluster-headache patients spend years labelled as having migraine before the right diagnosis is reached. The two conditions overlap on “severe one-sided headache” but separate cleanly on the features below:

Most adults with the attack pattern above have cluster headache. But two situations need careful exclusion: secondary causes (something causing the headache) and the rarer relatives of cluster headache within the same TAC family, which need different treatment.

Red-flag features that prompt further investigation

These features should not be assumed to be cluster headache without imaging and review:

• Sudden onset — thunderclap headache reaching peak intensity within seconds; suspect subarachnoid haemorrhagesubarachnoid haemorrhageBleeding into the space surrounding the brain, most often from a ruptured cerebral aneurysm. Classic presentation is a sudden, ‘worst-ever’ thunderclap headache. Investigated urgently with non-contrast CT brain and, if negative within 6 hours of onset, sometimes lumbar puncture. (often from a ruptured cerebral aneurysm) until proven otherwise
• New focal neurological deficit that persists between attacks — weakness, persistent slurred speech, persistent vision loss, persistent confusion
• Fever, neck stiffness or rash — suspect meningitis or encephalitis
• New cluster-pattern headache after age 50 — first-ever cluster headache later in life is uncommon and should prompt imaging
• Progressive headache — getting worse over days or weeks despite treatment; suspect a structural cause
• Headache after head injury
• Headache in pregnancy or postpartum — new or atypical headache here always needs same-day assessment
• Cancer history, immunosuppression or HIV with a new headache pattern
• Pituitary or endocrine symptoms accompanying cluster-pattern headache — visual field changes, milky discharge from the breast, unexplained weight or libido changes; pituitary lesions can mimic cluster headache and need dedicated pituitary imaging

The other trigeminal autonomic cephalalgias

Cluster headache is the most common of a small family of conditions sharing the autonomic-feature pattern but differing in attack length, frequency and treatment response:

• Paroxysmal hemicrania — shorter attacks (typically 2–30 minutes), usually more frequent than cluster headache, and the diagnostic feature is a dramatic and complete response to indomethacin. If you have cluster-pattern attacks but they are very short and very frequent, this is on the differential.
• Hemicrania continua — a continuous one-sided pain (rather than discrete attacks) with superimposed exacerbations and autonomic features; also indomethacin-responsive.
• SUNCT and SUNA — very brief shock-like attacks (1–600 seconds), occurring up to many times per hour. Different treatment again.

If your attacks do not fit the cluster-headache pattern described in section II, see our trigeminal autonomic cephalalgias guide and please flag the pattern at booking so we can plan the consultation appropriately. Distinguishing cluster headache from paroxysmal hemicrania matters in particular — the latter responds dramatically to a drug (indomethacin) that does little for true cluster headache.

Cluster-headache bouts seem to be driven by deep biological clocks — many patients have bouts that recur in the same season year after year — rather than by lifestyle triggers. Individual attacks within a bout, on the other hand, can be reliably triggered by a small set of exposures.

Triggers within a bout

• Alcohol — potent and rapid. Even a small amount can trigger an attack within minutes to an hour during an active bout. Outside bouts, alcohol usually has no effect at all.
• Napping or sleep onset — many patients have predictable attacks shortly after falling asleep; some avoid napping during a bout for this reason
• Volatile chemicals — petrol, solvents, paint thinners, perfume in some patients
• Altitude — flying, mountain travel, sometimes scuba diving
• Vasodilator medications — particularly nitrates (used in heart conditions), and sometimes phosphodiesterase-5 inhibitors. Worth flagging if you take either

Risk factors for the underlying tendency

• Sex — men are more often affected than women, although the ratio has narrowed in modern epidemiology to roughly two to three men for every woman, having been higher in older series
• Age of onset — typically the 20s to 40s, occasionally later
• Smoking — cluster-headache patients smoke at much higher rates than the general population. The association is consistent enough to be considered a risk factor, although stopping smoking after diagnosis has not been shown to alter the course of established cluster headache
• Family history — a small but real increase in risk for first-degree relatives, smaller than for migraine

Cluster headache is a clinical diagnosis: there is no blood test or scan that confirms it. The history almost always makes the diagnosis on its own when the features described in section II are present. What our diagnostic process at CURA actually involves:

1. A detailed history. The shape of the attack, timing, sidedness, autonomic features on the painful side, restlessness, bout pattern over months and years, what you have tried, what is and isn’t working, family history, smoking history, and a full medication review.
2. A targeted neurological examination. This is usually normal between attacks, which is itself useful information — persistent neurological signs between attacks are a red flag for a secondary cause.
3. Brain imaging (MRI), usually at first presentation. Cluster-pattern headache shares features with a small number of secondary causes — pituitary lesions can mimic the picture quite closely — so a baseline MRI brain (often with dedicated pituitary views) is typical at the first work-up, even when the clinical picture looks straightforward. We give you the request form at the consult; imaging is arranged through Medicare-rebated outpatient providers.
4. A written plan. Diagnosis, acute treatment, transitional bridging if needed, preventive choice and titration, when to come back, and what to take to your GP. We write back to your GP within five business days of your consultation with the same plan in clinical detail, including the prescribing specifics for your acute medications.

What the diagnosis depends on (the ICHD-3 criteria)

The International Classification of Headache Disorders, 3rd edition (ICHD-3, 2018) § 3.1 defines cluster headache as severe one-sided orbital, supraorbital or temporal pain lasting 15–180 minutes untreated, with at least one ipsilateral autonomic feature or a sense of restlessness or agitation, occurring at a frequency of one every other day to eight per day during a bout, and not better explained by another diagnosis. We work to these criteria, and the picture in section II maps directly onto them.

Acute (during-attack) therapy for cluster headache works best when it is fast, standard, and to hand at the moment an attack starts. The two evidence-leading treatments are subcutaneous sumatriptan and high-flow oxygen; intranasal zolmitriptan is a useful second line.

How the workflow runs at CURA

Acute prescriptions for cluster headache are issued through your GP, under our written plan — the standard Australian neurology workflow for cluster-headache acute therapy. Your GP can repeat sumatriptan and oxygen scripts the same day when a bout starts, without you waiting on a specialist appointment; they also hold the continuity between bouts. What we give you at the consult: a written acute plan (agent, dose, how to use it, when to step up, what not to use), and a letter to your GP with the prescribing specifics, sent within five business days.

Subcutaneous sumatriptansubcutaneous sumatriptanSumatriptan given as an injection just under the skin (typically 6 mg via a single-use autoinjector pen, brand name Imigran SC). The fastest-acting acute treatment for cluster headache. Contraindicated in significant cardiovascular disease, uncontrolled high blood pressure, and a small number of other situations. Daily dosing limited (usually no more than two doses in 24 hours). (Imigran SC autoinjector)

The fastest acute treatment for cluster headache. Delivered as a 6 mg subcutaneous injection via a single-use autoinjector pen, sumatriptan reaches peak plasma levels within about 10 minutes; most patients see attacks abort within 10–15 minutes. Practical points:

• Use it at the start of an attack, not after five minutes of waiting to see whether the attack is “a small one”. Cluster attacks are short; delay wastes treatment time
• How re-dosing actually works. The standard ceiling under the Imigran SC product information is two 6 mg autoinjectors in 24 hours. A second 6 mg dose may be considered at least one hour after the first if the original attack has recurred — not for a separate new attack within the same 24 hours. If you are reaching the ceiling regularly the preventive plan needs strengthening; please call us. Your individual dose ceiling is set on your script
• Cardiovascular and other contraindications matter. Triptans are not for patients with significant ischaemic heart disease, prior heart attack or stroke, uncontrolled hypertension, peripheral vascular disease, hemiplegic or basilar migraine, severe liver impairment, recent ergot use (within 24 hours), or recent MAOI antidepressant use (within two weeks). We screen for these at the consult and note any cautions in the GP letter
• Side effects are usually mild and short-lived: a brief flushing sensation, mild chest or throat tightness, tingling

High-flow oxygen via non-rebreather mask

For patients who can keep equipment at home, high-flow oxygen is one of the most reliable acute treatments for cluster headache and carries no daily-dose limit. Practical points:

• Delivered at 12–15 litres per minute through a non-rebreather mask — not a simple nasal-cannula setup, which delivers nowhere near enough
• Used for around 15 minutes at the start of an attack, sitting upright and leaning forward
• Many patients abort attacks within 10–15 minutes; a minority do not respond and need sumatriptan instead
• Home oxygen requires a prescription and arrangement with a home-oxygen supplier (e.g. Air Liquide, BOC). The acute plan we hand you, and the letter to your GP, walks them through the prescribing pathway
• Strict no-smoking-near-oxygen rules apply — the supplier covers the safety briefing

Intranasal zolmitriptanintranasal zolmitriptanZolmitriptan delivered as a nasal spray (typically 5 mg, brand name Zomig nasal spray). Useful where subcutaneous sumatriptan is not tolerated or not preferred. Slower onset than the subcutaneous route but faster than oral triptans. Same cardiovascular contraindications as other triptans. (Zomig nasal spray)

A useful second-line acute option, particularly when the subcutaneous route is not tolerated or preferred. Slower than subcutaneous sumatriptan but faster than oral triptans. Same cardiovascular contraindications as other triptans.

What does not work for cluster-headache attacks

• Oral triptans (sumatriptan tablets, rizatriptan wafers, etc.) — too slow. By the time they take effect, a cluster attack is often resolving on its own
• Simple analgesics (paracetamol, ibuprofen, aspirin) — ineffective, although patients understandably try them in the early years before diagnosis
• Opioids and codeine combinations — ineffective for cluster-headache attacks, and the daily use patterns they encourage cause harm. We strongly recommend against them

Acute treatment aborts an attack when it happens. Preventive treatment changes the bout itself: fewer attacks, less severe attacks, shorter overall bout. Most cluster-headache patients benefit from preventive therapy during every bout; many chronic patients stay on a preventive continuously.

Three preventive layers usually run in parallel: a fast-acting bridge (transitional steroid taper or a greater occipital nerve block) to bring attacks down within days, a main preventive (verapamil) titrated upwards to an effective dose, and — in selected cases — galcanezumab (Emgality) as a more targeted option for episodic cluster headache.

Verapamil — the first-line preventive

Verapamil is the workhorse cluster-headache preventive: well studied, widely used, and effective in most patients at high enough doses. The doses required are higher than those used for blood pressure or heart-rate control, which is why titration with monitoring matters.

• Typical titration. Start at 240 mg/day (often split as 80 mg three times daily). Titrate up by 80 mg every 1–2 weeks — sometimes faster during a severe bout — through 480 mg/day, then 720 mg/day, occasionally to 960 mg/day. Most patients respond between 480 and 720 mg/day
• ECG monitoring during titration. High verapamil doses can affect the heart’s electrical conduction (PR-interval prolongation, occasionally heart block). The standard pathway is a baseline ECG before the first dose, then a repeat ECG about 10 days after each significant dose increase, before stepping up again. Timing is individualised in the plan we send to your GP
• How the workflow runs. At CURA we design and write the titration plan; your GP or local cardiologist arranges and reviews the interval ECGs between dose steps. We see you back at the dose where most patients respond, or sooner if response is slow
• Common side effects: constipation (very common, treat early with adequate fluids and a stool softener), ankle swelling, mild bradycardia (slow heart rate), sometimes tiredness or low blood pressure. Most are dose-related and tolerable; severe constipation occasionally limits the dose
• Pregnancy and breastfeeding. Verapamil sits in the TGA pregnancy category C class — the risk-benefit conversation is genuine and is shared with your obstetric team. Triptan and oxygen plans are also reviewed specifically for pregnancy. Cluster headache is uncommon in pregnancy but does occur; please flag pregnancy or planning pregnancy at booking

Transitional therapy — bridging while verapamil is built up

Verapamil is reliable but slow. While it is being titrated up to an effective dose, you would otherwise be exposed to several more weeks of attacks. We bridge that period with a short, planned transitional preventive that gets attacks down within days:

• Oral steroid taper. A short tapering course of prednisolone over two to three weeks is the most widely used transitional preventive. It works well for most patients to break a bout while verapamil takes hold. We tailor the starting dose and taper schedule to bout severity, body weight and comorbidities (diabetes, glaucoma, mood and sleep disturbance, prior steroid exposure), and we are explicit that this is transitional, not ongoing — cluster headache should not be managed long-term on oral steroids
• Greater occipital nerve (GON) block. A short clinic injection of corticosteroid plus local anaesthetic into the soft tissues around the greater occipital nerve at the back of the head, on the same side as the pain. The block typically begins working within 24–72 hours and can break a stubborn bout. Dr Ashraf performs GON blocks at both Drummoyne and Penrith — usually at the same appointment as the consult when clinically appropriate, so you do not have to make a second trip

Galcanezumab (Emgality) for episodic cluster headache

Galcanezumab is a monoclonal antibody that blocks calcitonin gene-related peptide (CGRPCGRPCalcitonin gene-related peptide. A neuropeptide released around the trigeminal nerve and meningeal blood vessels during cluster-headache and migraine attacks. Blocking CGRP or its receptor with monoclonal antibodies is the basis of one class of newer headache therapies.), a key chemical messenger in cluster-headache and migraine attacks. For episodic cluster headache the dose is 300 mg subcutaneously at the start of a bout — different and higher than the migraine dosing schedule — based on the Goadsby et al. (NEJM, 2019) randomised controlled trial in episodic cluster headache.

• Australian regulatory status — off-label for cluster headache. Galcanezumab is registered with the TGA (Australian Register of Therapeutic Goods) for migraine prevention only. For episodic cluster headache, prescribing in Australia is off-label, supported by the FDA’s 2019 approval for that indication and the published RCT evidence base behind it. We confirm current ARTG indication wording against the manufacturer’s product information at the time of prescribing, and the off-label status is part of the consent conversation
• Not PBS-listed for cluster headache. Galcanezumab is PBS-subsidised for chronic migraine (under Authority criteria), not for cluster headache. Cluster-headache prescription is therefore private script only
• What it actually costs you. Out-of-pocket cost for the 300 mg loading dose and any subsequent monthly injections is roughly $700–$1,000 per month for the duration of your bout. Episodic cluster-headache bouts vary in length — for a bout running six to eight weeks (a common pattern), the total out-of-pocket cost typically runs in the low thousands. We discuss this honestly at consultation; please call our reception for a current dispensed-price estimate before deciding
• Who it is right for. We discuss honestly at consultation: whether your bouts are long enough that a 300 mg injection is worth its cost, whether verapamil at adequate dose and a transitional steroid taper have been tried first, your tolerance of injections, and whether the cost is workable for you
• What it is not. Galcanezumab is not a replacement for acute therapy — you still need subcutaneous sumatriptan or oxygen for individual attacks within a bout

Cluster headache demands a small set of practical adjustments, most of them limited to active bouts. Outside bouts, life is usually completely normal — a feature of episodic cluster headache that newly-diagnosed patients often find hard to believe, and which makes the diagnosis itself a relief.

During an active bout

• No alcohol. Even small amounts can trigger attacks within minutes
• Sleep regularly — same time to bed and same time up. Sudden changes can precipitate attacks
• Avoid napping if you have a pattern of sleep-onset attacks; many patients do
• Keep your acute treatment to hand — bedside, in your bag, in the car. A sumatriptan autoinjector you can’t reach quickly is a treatment delay
• Plan around predictable attack times. If you reliably wake at 2 am with an attack, set the oxygen and the autoinjector beside the bed

Smoking

Cluster-headache patients smoke at much higher rates than the general population, and the association is strong enough to be considered a risk factor. Stopping smoking has not been shown to shorten or abolish established cluster bouts — but the cardiovascular argument matters here specifically. Triptan and verapamil safety improve in non-smokers, and both are central to the cluster-headache treatment plan. We will support a cessation attempt actively where you want one, and we are happy to write back to your GP with a shared-care nicotine-replacement plan.

Mental health during bouts

Cluster headache, particularly chronic cluster headache and severe bouts, is associated with elevated rates of depression, anxiety, and suicidal ideation. We screen for this routinely at consultation and follow-up, not as a tick-box but as a core part of the condition. If you or someone you love is having thoughts of self-harm during a cluster bout, please reach out:

• Lifeline Australia — 13 11 14 (24-hour crisis support)
• Beyond Blue — 1300 22 4636
• Your GP, our reception, or the nearest emergency department

Cluster bouts pass. The right treatment plan changes the trajectory of bouts dramatically. Support during the worst of it is part of the medical job.

Work, study and driving

Most patients can keep working through a bout, with practical adjustments. The unpredictability of when the next attack will land is usually the harder issue than any single attack. Many patients tell their employer in general terms about a “neurological condition flaring for a few weeks” without disclosing the specific diagnosis; we are happy to write a short supporting letter for work, study or insurance where it would help. Do not drive during an active attack or in the minutes after using acute medication.

Travel and altitude

Air travel and high-altitude travel can trigger attacks during a bout. Carry your acute medication in your hand luggage with the prescriber’s letter. If you are flying with sumatriptan autoinjectors, declare them at security; airline rules usually accommodate them without difficulty.

Knowing what to expect makes the appointment go further. A typical first cluster-headache consultation at CURA looks like this:

1. Detailed history (about 30 minutes). The shape of the attack, sidedness, autonomic features, restlessness, the pattern of bouts over months and years, what you have tried, family history, smoking history, current medications.
2. Targeted neurological examination.
3. Review of your bout diary and prior imaging— if you have them.
4. A written plan — diagnosis, the acute plan to take to your GP for prescription (subcutaneous sumatriptan and/or home oxygen), the verapamil titration plan and ECG schedule, transitional bridging if you are mid-bout, a greater occipital nerve block at the same visit if clinically appropriate, and a follow-up timeline.
5. A GP letter within five business days with the full plan, including prescribing specifics for the acute medications and the verapamil schedule for them to oversee between dose steps.

What you will leave the consult with: a written acute plan, a letter to your GP, the verapamil titration plan and any transitional script, an MRI request form if imaging hasn’t been done, and (where appropriate) the relief of having had a GON block at the same visit.

What to bring:

• Your GP referral (required for Medicare rebates)
• Your bout diary (paper or notes-app screenshots are fine)
• A list of every preventive and acute medication you have tried for the headache, with dose, duration and reason for stopping
• Your current medication list
• Any prior brain imaging (USB, CD or radiology-portal access)
• Your Medicare card
• A friend or family member if you are mid-bout — an attack during the visit is uncommon but possible

A GP referral is required for the Medicare rebate on a specialist consultation. For current consultation fees, the Medicare rebate and the typical out-of-pocket gap, please call our reception on (02) 7906 8356.