Background: Cluster headache belongs to a group of idiopathic headache entities, the trigeminal autonomic cephalalgias (TACs), all of which involve short-lasting, unilateral, severe headache attacks and typical accompanying autonomic symptoms. The life-time prevalence of cluster headache for adults
Trigeminal autonomic cephalalgias (TACs) are characterized by frequent, short-lasting attacks of unilateral extremely severe headaches accompanied by ipsilateral facial autonomic features and are the most severe of the primary headache disorders. TACs include cluster headache (CH), paroxysmal
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