Cluster Headache Diagnosis and Management

Key Diagnostic Features

The American Academy of Neurology recommends considering migraine without aura in the differential diagnosis, characterized by a duration of 4-72 hours, associated symptoms of photophobia, phonophobia, nausea/vomiting, and a pulsating pain quality, with patients preferring to lie still in a dark, quiet room 1

The American College of Physicians suggests that neuroimaging is indicated if any of the following are present: focal neurological deficits, atypical headache pattern, progressive worsening, new neurological symptoms, or abnormal neurological examination, with MRI brain being the preferred modality 2

The American Headache Society recommends subcutaneous sumatriptan 6 mg and 100% oxygen inhalation at 12 L/min as first-line therapies for acute attack management, both with Level 1 evidence, with 70% of patients achieving relief within 10 minutes with sumatriptan and equal efficacy with oxygen therapy 2
The American Academy of Neurology suggests considering intranasal zolmitriptan 10 mg as an alternative acute therapy 3
The American Heart Association recommends screening for CAD risk factors, including hypertension, hypercholesterolemia, smoking, obesity, diabetes, and family history, before prescribing sumatriptan, with a strong consideration for cardiovascular evaluation if risk factors are present 2

The American Academy of Neurology recommends verapamil as the prophylactic drug of choice, starting at 360 mg/day, with monitoring of ECG for PR interval prolongation at higher doses, and considering oral corticosteroids or greater occipital nerve blockade as bridging therapy while verapamil takes effect 2
The American Headache Society suggests considering galcanezumab for episodic cluster headache, but not for chronic cluster headache, with lithium, topiramate, or divalproex sodium as add-on therapy for chronic cases 2, 3

The International Headache Society classification requires five attacks with a frequency of one to eight attacks on any given day, severe unilateral, supraorbital, or temporal pain lasting 15 to 180 minutes, and at least one ipsilateral autonomic symptom for a cluster headache diagnosis 4, 5
Severe unilateral pain lasting 15-180 minutes with ipsilateral autonomic symptoms, occurring in clusters with a frequency of 1-8 attacks daily, is diagnostic of cluster headache 4, 5

Cluster headache can be distinguished from migraine by its shorter duration (15-180 minutes vs. 4-72 hours), and the presence of ipsilateral autonomic symptoms, whereas migraine often has nausea/vomiting and photo/phonophobia, and patients prefer to lie still rather than pace 6, 7
Tension headache is typically bilateral with a pressing/tightening quality, mild to moderate intensity, and lacks autonomic features, distinguishing it from cluster headache 7