Abstract

Cluster headache is the most unique and painful of the primary headache disorders. The trigeminal-autonomic cepha- lalgias(TACs) are a group of primary headache syndromes which are characterized unilateral recurrent severe headache with cranial autonomic symptoms. The individual attack involves activation of the trigeminal-autonomic reflex. The TACs include cluster headache, paroxysmal hemicranias and short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing(SUNCT). They can be differentiated by attack duration and frequency. Cluster headache has the longest attack duration and relatively low attack frequency. These headache syndromes should be differentiated because of different management. Headache associated with sexual activity can occur with primary exertional headache and migrainous headache. We should consider comorbid conditions for specific management of other primary headaches.