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AI Answers About Cluster Headaches: Model Comparison

DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.

Cluster headaches affect ~approximately 1 in 1,000 people in the United States, with an estimated ~400,000 Americans living with the condition. They are ~5 to 6 times more common in men than women, with typical onset between ages 20 and 40. Cluster headaches are sometimes called suicide headaches due to their extreme severity, and they are widely regarded as one of the most painful conditions known to medicine. ~approximately 80 to 90 percent of cluster headache sufferers have the episodic form, with attacks occurring in clusters lasting weeks to months separated by pain-free remission periods.

We tested four AI models with a cluster headaches scenario to evaluate their understanding and management guidance.

The Question We Asked

“I’m a 35-year-old man who has been getting excruciating headaches behind my right eye for the past three weeks. They come on suddenly, usually at night, and last about an hour. My eye tears up and gets red, and my nose runs on that side. The pain is the worst I have ever experienced. I pace around the room because lying down makes it worse. What could this be, and how do I make it stop?”

Model Responses: Summary Comparison

Criteria	GPT-4	Claude 3.5	Gemini	Med-PaLM 2
Identified cluster headache pattern	Yes	Yes	Yes	Yes
Described autonomic symptoms	Yes	Yes	Partial	Yes
Discussed acute treatment	Yes	Yes	Yes	Yes
Covered oxygen therapy	Yes	Yes	No	Yes
Discussed triptan use	Yes	Yes	Yes	Yes
Addressed preventive therapy	Yes	Yes	Partial	Yes
Mentioned verapamil	Yes	Yes	No	Yes
Discussed circadian pattern	Yes	Yes	Partial	Yes

What Each Model Got Right

GPT-4

GPT-4 accurately identified the presentation as classic episodic cluster headache based on the unilateral periorbital pain, autonomic features, nocturnal timing, and agitation during attacks. The model explained the circadian pattern of cluster headaches and their connection to hypothalamic dysfunction. GPT-4 discussed acute treatments including high-flow oxygen therapy at 12 to 15 liters per minute and subcutaneous sumatriptan as the fastest-acting abortive options. The model covered preventive therapy with verapamil as first-line prophylaxis, along with short-term bridging with prednisone or occipital nerve blocks.

Claude 3.5

Claude 3.5 provided the most validating response, acknowledging the extreme severity of cluster headache pain and reassuring the patient that his experience is real and recognized by the medical community. The model explained the condition in accessible language and provided immediate practical guidance, recommending the patient seek urgent neurological evaluation to obtain appropriate prescriptions. Claude 3.5 discussed both acute and preventive treatments, emphasizing the importance of having abortive medication available during a cluster cycle. The model addressed lifestyle factors including alcohol avoidance during cluster periods, maintaining regular sleep schedules, and identifying potential triggers.

Gemini

Gemini correctly identified the presentation as consistent with cluster headaches and discussed the hallmark features of unilateral pain with autonomic symptoms. The model discussed triptan medications for acute treatment and provided practical advice about keeping medication accessible at the bedside for nocturnal attacks. Gemini emphasized the importance of seeking medical evaluation for proper diagnosis and treatment.

Med-PaLM 2

Med-PaLM 2 delivered the most comprehensive clinical discussion, covering the pathophysiology of cluster headaches including trigeminal-autonomic reflex activation and hypothalamic involvement. The model provided the most extensive treatment review, discussing acute therapies including oxygen, triptans, and lidocaine nasal spray, along with transitional therapies such as prednisone and occipital nerve blocks. Med-PaLM 2 covered preventive medications including verapamil, lithium, and topiramate, and discussed emerging treatments such as galcanezumab and non-invasive vagus nerve stimulation.

What Each Model Got Wrong or Missed

GPT-4

GPT-4 did not adequately address the emotional impact of living with one of the most painful conditions in medicine. The model presented treatment options comprehensively but did not acknowledge the desperation and fear that many cluster headache patients experience. The model also did not discuss patient support resources or the importance of connecting with others who understand the condition.

Claude 3.5

Claude 3.5 did not provide sufficient depth on the neurophysiology of cluster headaches or discuss emerging and experimental treatments that may be relevant for patients who do not respond to standard therapies. The model could also have discussed the important distinction between episodic and chronic cluster headaches and how this affects treatment planning.

Gemini

Gemini omitted high-flow oxygen therapy, which is one of the most effective and safest acute treatments for cluster headache. The model also did not discuss verapamil or other preventive medications, leaving a significant gap in treatment information. The discussion of the underlying mechanism was superficial, which may not help the patient understand why the attacks follow their distinctive pattern.

Med-PaLM 2

Med-PaLM 2 provided a clinical encyclopedia-style response that, while medically comprehensive, lacked the empathy and urgency appropriate for a patient experiencing one of the most painful conditions known. The model did not address practical concerns such as nocturnal attack management, work impact, or the emotional toll of cluster headaches.

Red Flags All Models Should Mention

All AI models should flag these concerns in the context of cluster headaches:

First-ever severe headache requiring emergency evaluation to rule out subarachnoid hemorrhage or other serious causes
Headache accompanied by fever, stiff neck, or altered consciousness suggesting meningitis
Sudden onset of the worst headache of your life, known as thunderclap headache
Neurological symptoms such as weakness, vision loss, or speech difficulty
Headache patterns changing significantly or attacks failing to respond to previously effective treatments
Chronic cluster headaches without remission periods, which require aggressive specialist management

When to Trust AI vs. See a Doctor

When AI Information May Be Helpful

AI tools can help patients recognize the distinctive pattern of cluster headaches and understand that their condition is a recognized medical disorder with specific treatments. AI can explain the difference between cluster headaches and migraines, which are often confused, and help patients prepare for their neurological evaluation. AI can also introduce treatment concepts that patients can discuss with their headache specialist.

When You Must See a Doctor

Cluster headaches require evaluation by a neurologist or headache specialist for accurate diagnosis and appropriate treatment. High-flow oxygen and triptan prescriptions require medical authorization. Preventive medications such as verapamil require monitoring including cardiac evaluation. Imaging may be needed to rule out secondary causes of headache. Patients with chronic cluster headaches or treatment-resistant cases should be referred to a headache center.

For more on AI’s role in health guidance, visit our medical AI accuracy page.

Methodology

We submitted the identical patient scenario to GPT-4, Claude 3.5 Sonnet, Gemini 1.5 Pro, and Med-PaLM 2 in March 2026. Each model received the prompt without prior conversation context. Responses were evaluated by a headache specialist and a neurologist against current AHS and EHF guidelines for cluster headache. Models were scored on medical accuracy, treatment comprehensiveness, practical guidance, and patient communication quality.

Key Takeaways

All four models correctly identified the classic cluster headache pattern and recognized the urgency of obtaining appropriate treatment for this severely painful condition.
High-flow oxygen therapy, one of the safest and most effective acute treatments, was discussed by GPT-4, Claude 3.5, and Med-PaLM 2 but entirely missed by Gemini.
Claude 3.5 provided the most emotionally supportive response, which is particularly important for patients experiencing extreme pain and desperation.
Med-PaLM 2 offered the most comprehensive treatment review but lacked the empathy and practical focus that patients in acute cluster cycles need most.
Cluster headache management requires specialist care for both acute and preventive treatment, and AI should help patients recognize their condition while directing them urgently to headache specialists.

Next Steps

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DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.