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Diagnostic Criteria and Clinical Presentation of Cluster Headache

Cluster headache, often referred to colloquially as "suicide headache" due to its excruciating severity, is a primary headache disorder with a prevalence of approximately 0.1%. It displays a clear male predominance, with male-to-female ratios ranging from 3:1 to 4.3:1. Recognizing its clinical presentation and adhering strictly to established diagnostic guidelines ensures accurate distinction from other severe headache syndromes.

According to the International Classification of Headache Disorders (ICHD-3), diagnosing cluster headache requires a patient to have experienced at least 5 distinct attacks meeting specific criteria. The pain must be severe or very severe, strictly unilateral, and localized to the orbital, supraorbital, or temporal regions. Left untreated, an attack typically lasts between 15 and 180 minutes. During active periods, attack frequency ranges from one attack every other day to up to eight attacks per day.

The pain must be accompanied by at least one ipsilateral cranial autonomic feature or a sense of restlessness/agitation. Autonomic signs include conjunctival injection, lacrimation, nasal congestion, rhinorrhea, eyelid edema, forehead/facial sweating or flushing, ear fullness, or miosis/ptosis. Unlike migraine sufferers who prefer to lie still in a quiet, dark room, patients experiencing a cluster headache attack are characteristically restless, pacing around or rocking back and forth due to severe agony.

Cluster headache is classified into two distinct temporal subtypes:

  • Episodic Cluster Headache: Characterized by at least two cluster periods lasting from 7 days to 1 year, separated by pain-free remission intervals lasting 1 month or longer.

  • Chronic Cluster Headache: Attacks occur for more than 1 year without a remission period, or with remission periods lasting less than 1 month.

While clinical presentation is key, neuroimaging (such as MRI) is routinely recommended upon initial presentation to rule out secondary causes of cluster-like headaches, including structural lesions or vascular malformations.

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