Trigeminal autonomic cephalalgias (TACs) are a group of headache disorders characterized by repetitive, brief episodes of severe unilateral pain accompanied by ipsilateral autonomic symptoms such as rhinorrhea, nasal congestion, lacrimation, and conjunctival injection. The primary conditions within this group include cluster headache, paroxysmal hemicrania, and short-lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT) syndrome. These conditions vary in episode duration, frequency, and rhythmicity. TACs are more prevalent in adults and are rarely observed in children.

Cluster Headache

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