Cluster Headache: A Guide to Better Patient Care for Healthcare Professionals

Written by: Vera Gibb, DNP, APRN, FNP-C, AQH, CCTP and Ashley S. Hattle-Clemenshaw

Sponsored in part by Amneal Pharmaceuticals.

Cluster headache (CH), often referred to as the “suicide headache,” is considered one of the most severe pain conditions in medicine.¹ Despite its severity and distinct clinical presentation, cluster headache remains underdiagnosed, misunderstood, and frequently mismanaged in healthcare settings.² For many individuals, it can take years and seeing multiple providers before receiving an accurate diagnosis and effective treatment.

This article aims to close that gap by providing a detailed overview of cluster headache, along with the lived experience of medical journalist Ashley S. Hattle-Clemenshaw, who was diagnosed at 18 and has since become a leading advocate for cluster headache awareness and education. Her firsthand account—paired with the latest clinical evidence—offers a first-hand perspective on what individuals wish more providers knew: how to recognize cluster headache quickly, how to treat it appropriately, and how to avoid the common missteps that can result in years of unnecessary suffering for people.

Whether you’re a clinician specializing in primary care, urgent care, student health, emergency, or neurology, this article will equip you with the tools and context to better support individuals living with one of the most painful conditions known to man.

What is Cluster Headache?

Cluster headache, the most common trigeminal autonomic cephalalgia (TAC), is a primary headache disorder marked by recurrent, excruciating unilateral head pain accompanied by autonomic symptoms.³ Despite its distinctive clinical features, cluster headache remains frequently misdiagnosed or overlooked in practice.

Diagnostic Features of Cluster Headache:⁴

• Pain: Severe to very severe unilateral pain, typically orbital, supraorbital, and/or temporal
• Duration: 15 to 180 minutes per attack when untreated
• One of the following signs or symptoms occurs on the same side of the headache:
  • Autonomic symptoms: redness or tearing of the eye, nasal congestion or runny nose, eyelid swelling or drooping, forehead and facial sweating, and/or constricted pupils
  • Behavioral features: Restlessness or agitation during attacks
• Frequency: From one attack every other day to as many as eight per day during active bouts

Episodic vs Chronic Cluster Headache:

• Episodic Cluster Headache (ECH): Cluster cycles followed by pain-free remissions lasting ≥ 3 months⁵
• Chronic Cluster Headache (CCH): No remission or remissions lasting <3 months for at least one year⁶

Rhythmicity:

• Circadian pattern: Attacks often occur at the same time each day, often at night
• Circannual pattern: Cluster cycles tend to occur at specific times of the year

Ashley’s first cluster headache occurred the summer after high school graduation. While working as a lifeguard, she experienced what felt like a lightning bolt striking the right side of her head. The stabbing pain pierced through her skull and settled behind her eye—“like a knife twisting in my brain,” she recalls.

The attacks returned the next day at approximately 2 p.m.—the same time—and again the following day. By the end of the second week, she saw a neurologist in Lincoln, Nebraska, who recognized the pattern and correctly diagnosed her with cluster headache. He prescribed a short course of prednisone, and remarkably, the attacks ceased the next day.

Ashley was fortunate to encounter a provider familiar with this rare but debilitating disorder. Many people are not as lucky. Her story highlights the crucial importance of provider education, timely diagnosis, and evidence-based treatment.

The Challenge of Accurate Diagnosis

Despite cluster headaches’ distinct clinical features, diagnostic delays are common. On average, it takes 5 years from symptom onset for an individual to receive an accurate diagnosis.⁷ Both general practitioners and neurologists report difficulty diagnosing cluster headache, in part due to low disease familiarity and overlapping symptoms with other primary headache disorders like migraine.

Cluster headache often begins during adolescence or even childhood, yet it is rarely diagnosed before adulthood. Individuals typically consult between two and five different clinicians across various specialties before receiving an accurate diagnosis.⁸

In 2020, neurologists introduced the 3-Item Erwin Test for Cluster Headache, a brief screening tool that has been shown to improve diagnostic accuracy.⁹ While it holds promise for streamlining diagnosis in primary care and emergency settings, its adoption in clinical practice has not yet been widely implemented.⁹

The test asks 3 questions:⁹

1. Is this the worst pain you have ever experienced? Yes, No
2. Imagine setting a timer. Does the headache last less than 4 hours? Yes, No
3. During a headache, do one or more of these happen to you? Yes, No
   • Your eye turns red on only one side
   • Your eye waters on only one side
   • Your nose runs on only one side
   • Your nose gets congested on only one side

A yes to all three questions has 85% sensitivity and 89% specificity for cluster headache.⁹

In addition to structured tools, visual aids—such as videos demonstrating attack behavior—may be more effective in educating providers and aiding recognition. These media formats can also empower people to identify their condition earlier and seek appropriate care.

Watch a cluster headache attack video:¹⁰

Cluster Headache Triggers

Cluster Headache attacks often occur spontaneously, but certain triggers are well-documented, especially during active cluster cycles:^4,11,12

• Vasodilating medications (e.g., nitroglycerin)
• Alcohol
• Histamine
• Foods containing nitrates (e.g., cured meats)
• Strong odors (e.g., solvents, cigarette smoke)
• Napping

Key Point: Triggers are typically influential only during active bouts. Between bouts, individuals with cluster headache often find they can smoke or drink alcohol without triggering an attack.

Diagnostic Testing

Neuroimaging is recommended for new presentations of cluster headache; well-established cluster headache does not need further imaging or testing. However, imaging plays an important role in initial evaluations, especially with:¹¹

• New or atypical presentation (e.g., first-time symptoms, unusual headache pattern, age >50, or other red flags indicating possible secondary causes)
• Sudden changes in headache features, including increased frequency or severity, a change in location or character, or a description such as “the worst headache of my life”
• Neurologic findings, including double vision, vision loss, weakness or sensory deficits, changes in mental status or personality
• Systemic illness signs, such as fever or rash

Magnetic resonance imaging is the first-line test to rule out structural abnormalities or mimics of cluster headache, such as brain tumors, vascular malformations, pituitary lesions, infections, or inflammatory conditions affecting the orbit or cavernous sinus.¹¹

Key point: While neuroimaging is a critical tool for ruling out secondary causes, it should not delay treatment initiation when the cluster headache diagnosis is likely.¹¹

Cluster Headache Treatment

Effective management includes three key strategies:

• Abortive treatments: for acute attacks
• Transitional treatments: to bridge the relief while preventive medications take effect
• Preventive treatments: for the duration of the episodic cluster attack or long-term use in chronic cluster headache

Abortive Treatment Options for Cluster Headache:¹¹

• High-flow oxygen: 100% oxygen via non-rebreather mask at 12–15 L/min for 15–20 minutes.
• Dihydroergotamine: (FDA approved) 
• Sumatriptan: 6 mg subcutaneous injection, may be repeated after one hour if needed. (FDA approved); or 20 mg intranasal (maximum 40 mg/day).
• Zolmitriptan: 5–10 mg intranasal, may repeat once after two hours; oral option is 5 mg (max 10 mg/day).
• Lidocaine: 1 mg of 10% solution applied intranasally with cotton swabs bilaterally for up to five days.
• Octreotide: 100 mcg/mL subcutaneously.
• Non-invasive vagus nerve stimulation (nVNS): Three consecutive 2-minute stimulations over the vagus nerve in the neck; may be repeated for up to four attacks daily (maximum eight stimulations per day). This treatment is FDA-cleared for cluster headache.

Key Point: These treatments are abortive and not effective for prevention. Triptans should be used fewer than 10 days per month to minimize the risk of medication overuse headache.

Transitional Treatment Options for Cluster Headache:¹¹

Transitional treatments are used during the initiation of preventive treatment to provide relief until prophylactic medications take full effect. Options include:

• Suboccipital steroid injections (first-line)
• Corticosteroids
  • Prednisone: 50–80 mg/day orally tapered gradually over 10–12 days.
  • Methylprednisolone: 100 mg orally or 500 mg IV daily for five days.

Key Point: Corticosteroids should be used only short term due to the risk of serious adverse effects associated with prolonged use.

Preventive Treatment Options for Cluster Headache:¹¹

Preventive treatments aim to reduce the frequency and severity of attacks during a cluster cycle. Options include:

• Verapamil: Minimum dose of 240 mg orally per day, given in a single or divided dose. Dose titration and ECG monitoring are recommended due to potential cardiac effects.
• Lithium: 800–900 mg per day, taken with meals in divided doses. Monitor serum levels, thyroid, and renal function regularly.
• Topiramate: Start with 25 mg orally daily for seven days, then increase by 25 mg per week to a minimum of 100 mg/day (maximum 400 mg/day), as tolerated.
• Galcanezumab: Administered as three subcutaneous injections of 100 mg/mL monthly (total 300 mg/month). FDA-approved for episodic cluster headache.
• Melatonin: 10 mg orally at bedtime; may be helpful, especially for those with circadian rhythm disruption.
• Non-invasive vagus nerve stimulation (nVNS): Three consecutive 2-minute stimulations over the vagus nerve in the neck, once or twice daily. This treatment is FDA-cleared for cluster headache.

Surgical options (typically reserved for refractory or chronic cluster headache):

• Deep brain stimulation via surgical implantation. These are considered only for severe, treatment-resistant cases.

Treatment Challenges

Despite receiving an accurate diagnosis early on, Ashley’s path to effective treatment was anything but straightforward. Like many people with cluster headache, she encountered dismissive attitudes, inappropriate prescriptions, and systemic barriers in both emergency and primary care settings.

In the ED, despite stating she had a confirmed cluster headache diagnosis, providers repeatedly referred to her condition as “migraine”—some even telling her “women don’t get cluster headaches.” She was treated with hydrocodone, a medication not indicated for cluster headache, and perceived as drug-seeking when she returned during active cycles.

Her experience with primary care was equally challenging. She was told to try diphenhydramine and was given sumatriptan 100 mg tablets, which is the incorrect method of administration and too slow to abort her attacks, though it sometimes brought her temporary relief. Insurance restrictions limited her to nine tablets per month—far below the number needed during a cluster cycle. Eventually, a provider prescribed sumatriptan 6 mg subcutaneous injections, which was the correct method of administration, and finally stopped her attacks within minutes. Over time, she found that using a 3 mg dose was sufficient. 

After a five-year battle, Ashley found a primary care provider who took the time to read the recommended treatments for cluster headache and prescribed high-flow oxygen, an effective, evidence-based abortive therapy for cluster headache. Critically, patients need 100% oxygen at ≥12 L/min via a nonrebreather mask; nasal cannulas and valve masks are ineffective to abort cluster headache attacks.

Community Resources, Education and Support Groups

Frustrated by the lack of resources, Ashley searched bookstores for information on cluster headache—only to find a few paragraphs buried in general headache guides. That changed in 2014 when she attended her first Clusterbusters Conference in Nashville. There, she met dozens of people with cluster headache, families, and headache specialists. The experience was transformative.

Inspired by their stories and armed with a growing stack of research, Ashley began writing. Her book, Cluster Headaches: A Guide to Surviving One of the Most Painful Conditions Known to Man, was published in 2017 and quickly became a vital resource for those affected by the condition. Nicknamed the “Cluster Headache Bible,” it includes chapters for people with cluster headache, loved ones, and healthcare providers, with a dedicated section on oxygen therapy. It has since won multiple awards and is widely recommended by headache specialists.

Ashley and her husband, Andrew Clemenshaw, who also has chronic cluster headache, met at her first Clusterbuster conference. They advocate through Clusterbusters and other organizations, supporting people with cluster headache through education, policy, and peer connection. As a woman who has experienced natural childbirth, she often says, “Cluster pain is as bad as unmedicated childbirth—but without the euphoria of a baby at the end.”

Conclusion

People with cluster headache endure excruciating, isolating pain that can be life-threatening due to its strong link with suicidality. They don’t just need medication—they need to be heard, believed, and supported. Here’s how you can help:

1. Recognize the Pattern: One-sided, stabbing pain (ice pick/hot poker), with same-side autonomic signs (red, watery eye; nasal congestion). Attacks last 15–180 minutes, often at night, with visible agitation (rocking, pacing).
2. Ask About the Past Cluster Headache Cycles: Episodic cluster headache can disappear for years, but individuals often recall cycles vividly. Be thorough with history-taking; memories can trigger distress or PTSD-like symptoms.
3. Forget the Stereotypes: Cluster headache isn’t just a middle-aged white male disease. It affects women, children, and people of color. Let symptoms—not appearance—guide diagnosis.
4. Don’t Rely on the Pain Scale: Cluster headache pain peaks rapidly and intensely. Instead of asking, “How painful is it?” ask about behaviors during attacks like pacing or an inability to stay still.
5. Skip the Narcotics: Opioids aren’t effective for cluster headache and may worsen outcomes. Believe people with cluster headache when they say narcotics are ineffective. Use oxygen, subcutaneous triptans, or dihydroergotamine.
6. Use High-Flow Oxygen: First-line, rapid, and safe. Must be 100% oxygen at 12–15 L/min via a non-rebreather mask. Educate people with cluster headache on the correct use of equipment and access to it.
7. Don’t Give Up: Cluster headache is not migraine. People with cluster headache often face stigma and failed treatments—stay supportive. Even previously ineffective treatments may work again over time.
8. Always Screen for Suicide Risk: Cluster headache has a well-documented association with suicidal ideation, particularly during active attacks. Suicide risk escalates with demoralization, misdiagnosis, and inadequate treatment.¹³ Your belief in them and proactive management can be life-saving. Effectively reducing attack frequency and severity also lowers suicide risk.¹⁴ Inform individuals to call 988 or text TALK to 741-741 for immediate support.
9. Referral to Neurologist or Headache Specialist: Cluster headache requires expert management. Refer to a neurologist or headache specialist.

Sponsored in part by:

References

1. Burish, M. J., Pearson, S. M., Shapiro, R. E., Zhang, W., & Schor, L. I. (2021). Cluster headache is one of the most intensely painful human conditions: Results from the International Cluster Headache Questionnaire. Headache, 61(1), 117–124. https://doi.org/10.1111/head.14021
2. Buture A, Ahmed F, Mehta Y, Paemeleire K, Goadsby PJ, Dikomitis L. Perceptions, experiences, and understandings of cluster headache among GPs and neurologists: a qualitative study. Br J Gen Pract. 2020 Jun 25;70(696):e514-e522. doi: 10.3399/bjgp20X710417. PMID: 32482627; PMCID: PMC7274540.
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4. https://ichd-3.org/3-trigeminal-autonomic-cephalalgias/3-1-cluster-headache/
5. https://ichd-3.org/3-trigeminal-autonomic-cephalalgias/3-1-cluster-headache/3-1-1-episodic-cluster-headache/
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9. Parakramaweera, R., Evans, R. W., Schor, L. I., Pearson, S. M., Martinez, R., Cammarata, J. S., Amin, A. J., Yoo, S. H., Zhang, W., Yan, Y., & Burish, M. J. (2021). A brief diagnostic screen for cluster headache: Creation and initial validation of the Erwin Test for Cluster Headache. Cephalalgia : an international journal of headache, 41(13), 1298–1309. https://doi.org/10.1177/03331024211018138).
10. https://www.youtube.com/watch?v=ak8rohvElkQ
11. Malu, O. O., Bailey, J., & Hawks, M. K. (2022). Cluster Headache: Rapid Evidence Review. American family physician, 105(1), 24–32). https://www.aafp.org/pubs/afp/issues/2022/0100/p24.html
12. Leroux E, Ducros A. Cluster headache. Orphanet J Rare Dis. 2008 Jul 23;3:20. doi: 10.1186/1750-1172-3-20. PMID: 18651939; PMCID: PMC2517059.
13. Koo, B.B., Bayoumi, A., Albanna, A. et al. Demoralization predicts suicidality in patients with cluster headache. J Headache Pain 22, 28 (2021). https://doi.org/10.1186/s10194-021-01241-7
14. Ji Lee, M., Cho, S. J., Wook Park, J., Kyung , M., Moon, H. S., Chung, P. W., Myun Chung, J., Sohn, J. H., Kim, B. K., Kim, B. S., Kim, S. K., Song, T. J., Choi, Y. J., Park, K. Y., Oh, K., Ahn, J. Y., Lee, K. S., Cho, S., & Chung, C. S. (2019). Increased suicidality in patients with cluster headache. Cephalalgia: an international journal of headache, 39(10), 1249–1256. https://doi.org/10.1177/0333102419845660

Additional Resources

1. Cluster headaches cause years of needless pain
2. Cluster headache vs. labor: A comparative perspective on acute pain during and after delivery
3. Hattle, A. (2017). Cluster Headaches: A Guide to Surviving One of the Most Painful Conditions Known to Man Perfect Paperback. BookBaby.