Article Topic: Trigeminal Autonomic Cephalalgias (TACs) Author name: Sara Shatnawi Keywords: cluster headache, hemicarnia continua, paroxysmal hemicarnia, nVNS, SUNCT. Overview Trigeminal autonomic cephalalgias (TACs) are a group of primary headache disorders which include cluster headache, paroxysmal hemicrania (PH), hemicrania continua, short-lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), and short-lasting unilateral headache with cranial autonomic symptom (SUNA). All TACs share common features of recurrent unilateral pain and are often accompanied by ipsilateral cranial autonomic features such as ptosis, conjunctival injection, lacrimation, nasal congestion, or rhinorrhea.  The duration of the attacks, their frequency, and the way the headache responds […]