Last Updated on June 11, 2026
Cluster headache is one of the most severe pains in all of medicine. In a large study, patients rated it 9.7 out of 10 — above labour pain (7.2) and kidney stones (6.9). The good news: it is very treatable, which is exactly why getting the diagnosis right matters.
This page explains what cluster headache feels like, how that pain compares with other severe conditions, and why early diagnosis and treatment make such a difference.
What is cluster headache?
Cluster headache is a severe, episodic headache that often runs in seasonal bouts (classically around spring). The pain is stabbing and usually maximal in intensity, and it is typically accompanied — on the same side as the headache — by:
- A droopy or swollen eyelid and a watery, red eye
- A blocked or runny nose
- Restlessness or agitation during an attack
Most patients describe the pain as 10/10 — and a recent study set out to measure just how bad that really is.
The pain scale — worse than childbirth
In a study published in the journal Headache, more than 1,600 people with cluster headache rated their pain against other painful conditions they had personally experienced.
Cluster headache was rated more intense than any other condition examined, at 9.7. The next most painful — labour pain — came in at 7.2, a full 2.5 points lower. Pancreatitis (7.0) and kidney stones (6.9) followed. To put that in context, a score of 7 or more counts as severe pain.
Cluster headache (9.7) rated more painful than labour (7.2), pancreatitis (7.0) and kidney stones (6.9).
It is very treatable — so diagnosis matters
Despite the severity, cluster headache responds well to treatment. There are fast-acting options to stop an attack (such as high-flow oxygen and other acute treatments), as well as short- and long-term preventive medications to reduce how often attacks occur. The main problem is that cluster headache is often diagnosed late — so recognising the pattern early, and starting the right treatment, can transform someone’s life. You can read more about headache on our headache page.
If you recognise this pattern — severe one-sided attacks with a watery eye and blocked nose — it is worth seeking a diagnosis. Effective treatments exist, and they work.
Frequently asked questions
How bad is cluster headache pain?
Extremely severe — rated 9.7 out of 10 in a large study, the highest of any condition examined, and higher than labour pain or kidney stones.
What does a cluster headache feel like?
A stabbing, one-sided headache of maximal intensity, usually with a droopy or watery eye and a blocked or runny nose on the same side, often coming in seasonal bouts.
Is cluster headache really worse than childbirth?
In this study, yes — patients who had experienced both rated cluster headache (9.7) as more painful than labour (7.2).
Is cluster headache treatable?
Yes. There are effective treatments to stop an attack (such as high-flow oxygen) and short- and long-term preventives to reduce attack frequency.
Why is cluster headache often diagnosed late?
Because it is relatively uncommon and the pattern can be mistaken for other headaches or sinus problems — which is why recognising the tell-tale features matters.
Need help with severe headache?
If this sounds like what you experience, an accurate diagnosis and the right treatment can make an enormous difference. Ask your GP for a referral to East Neurology, Bondi Junction, then get in touch.
Or call 02 9388 0615. East Neurology is a private specialist practice focused on expert diagnosis and prompt results; your Medicare rebate is processed for you on the day.