Short-Lasting Unilateral Neuralgiform Headache With Conjunctival Injection and Tearing (SUNCT) By Stephen D Silberstein, MD, Sidney Kimmel Medical College at Thomas Jefferson University Reviewed / Revised Apr 2023 View Patient Education Diagnosis Treatment Short-lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT) and short-lasting unilateral neuralgiform headache attack (SUNA) are rare headache disorders characterized by extremely frequent attacks of unilateral head pain and autonomic activation.