Trigeminal Autonomic Cephalalgias (TACs) – Paroxysmal Hemicrania

Paroxysmal hemicrania (PH) was first described by Sjaastad and Dale and called ‘chronic PH’ 2 years later. The current International Classification of Headache Disorders (ICHD-II) classification criteria requires at least 20 attacks of severe unilateral orbital, supraorbital, or temporal pain, lasting 2–30 min, accompanied by ipsilateral cranial autonomic features such as ptosis, eyelid edema, conjunctival injection, lacrimation, nasal blockage, or rhinorrhoea. Attacks usually have a frequency of above five a day, and respond completely to indomethacin. Since the initial description, more than 100 cases have described in the literature.