Table 2.

Clinical differences between trigeminal neuralgia and SUNCT/SUNA

Features	Trigeminal neuralgia	SUNCT/SUNA
Predominant pain distribution	V2/V3>V1	V1>V2/V3
Severity of pain	Very severe	Very severe
Duration (seconds)	<1–120	1–600
Autonomic features	None or sparse	Prominent
Spontaneous attacks only	None or rare	40%
Refractory period	Present	Absent
Periodicity	Mostly episodic	Mostly chronic
Preventive treatment of choice	Carbamazepine or oxcarbazepine	Lamotrigine

SUNA, short-lasting unilateral neuralgiform headache attacks with cranial autonomic symptoms; SUNCT, short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing; V1, first division of the trigeminal nerve; V2, second division of the trigeminal nerve; V3, third division of the trigeminal nerve.