Abstract
Trigeminal Autonomic Cephalalgias (TACs) are characterized by the presence of autonomic symptoms during headache attacks. The most common symptoms include rhinorrhea, nasal congestion, conjunctival injection, and lacrimation. TACs are typically unilateral and include cluster headaches, paroxysmal hemicrania, hemicrania continua, short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing (SUNCT), and short-lasting unilateral neuralgiform headache attacks with cranial autonomic symptoms (SUNA). TACs can occur in episodic or chronic forms. The most important factor in differentiating between the various types of TACs is the duration of the headache attacks.