Cluster headache (CH) is a disorder of unilateral attacks of severe periorbital, supraorbital or temporal pain, lasting 15±180 min (1). In general, attacks are accompanied by autonomic symptoms, i.e. ipsilateral miosis, lacrimation, conjunctival injection, nasal congestion and rhinorrhea. The episodic form of CH, found in about 80% of all CH patients, is characterized by its distinct temporal p...
