Health condition
Cluster headaches
Cluster headache causes attacks of excruciating one-sided pain around the eye, often nightly for weeks at a time - frequently misdiagnosed, yet highly responsive to the right treatment.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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Attacks last 15 minutes to 3 hours, often waking you at the same time each night
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The affected eye may water and redden, with a droopy lid and blocked nostril on that side
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High-flow oxygen and sumatriptan injections abort attacks; verapamil prevents them
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Specialist: a consultant neurologist with a headache interest
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
Cluster headache is one of the most painful conditions known, producing bouts of severe, strictly one-sided pain centred on the eye or temple, with restlessness and agitation rather than the stillness of migraine. Attacks arrive in clusters lasting weeks or months, often at the same times of day, before remitting entirely - sometimes for years.
Diagnosis and treatment routes
Diagnosis is clinical, and an MRI is usually arranged once to exclude secondary causes. Standard painkillers do not work: attacks are aborted with high-flow oxygen through a non-rebreather mask or sumatriptan injections, while verapamil taken daily is the mainstay preventive, sometimes with a short steroid bridge at the start of a bout. In many parts of the UK, routine NHS referrals for this kind of problem currently take 20-45+ weeks, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant neurologist. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Cluster headaches.
Quick, plain-English answers to what people ask us most.
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What are cluster headaches?
Cluster headaches are one of the most severe primary headache disorders, causing intense, one-sided pain typically around the eye, occurring in a series of attacks (a 'cluster period') lasting weeks to months, followed by pain-free remission periods that can last months to years. Each individual attack is usually brief, from 15 minutes to a few hours, but extremely painful. They are more common in men, though they also affect women.
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How do I recognise a cluster headache attack?
Look for severe, one-sided pain centred around the eye or temple, accompanied by same-side symptoms such as a red or watering eye, a drooping eyelid, and nasal congestion or runniness. A distinctive feature is restlessness during an attack — unlike migraine, people often want to move around, pace, or rock rather than lie still. Attacks often occur at a similar time each day, sometimes waking a person from sleep.
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What triggers cluster headache attacks?
During an active cluster period, alcohol is a well-recognised and fairly reliable trigger for many people, though it typically doesn't trigger attacks during remission periods when someone is not in an active cluster. Strong smells, high altitude, and overheating have also been reported as triggers by some people. Identifying and avoiding personal triggers during a cluster period can help reduce attack frequency.
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Can cluster headaches be cured?
There is no cure, since the underlying cause is not fully understood, but effective acute and preventive treatments can significantly reduce the frequency and severity of attacks during a cluster period. Many people experience long remission periods between clusters, sometimes lasting years, though the pattern varies between individuals. A smaller proportion of people have a chronic form without clear remission periods, which needs ongoing preventive treatment.
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What treatments are available?
Fast-acting treatments for individual attacks include high-flow oxygen therapy and injectable or nasal spray triptans, chosen because they act quickly enough for the short duration of attacks. Preventive treatments, started at the beginning of a cluster period, aim to reduce how often and how severely attacks occur during that period. Newer targeted treatments, including specific injectable medications, have also shown benefit for some people with frequent cluster headaches.
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When should I see a specialist?
See a doctor for severe, recurring headaches matching this pattern, ideally as soon as possible during a cluster period so effective treatment can be started promptly. NHS headache clinic referral can take several weeks; a private headache specialist consultation is typically available within about 2 weeks for faster access to effective, targeted treatment.