Headache Cluster headache 2013-03-12T11:37:40Z HP:0012199 ICD-10:G44.0 A type of headache characterized by repeated attacks of unilateral pain lasting 15 to 180 minutes and associated with local autonomic signs. SNOMEDCT_US:193031009 SNOMEDCT_US:193947008 SNOMEDCT_US:230473009 According to the International Classification of Headache Disorders (ICHD-II), the diagnosis of cluster headache can be made with at least five attacks fulfilling criteria B-D: (B) Severe or very severe unilateral orbital, supraorbital and/or temporal pain lasting 15-180 minutes if untreated. (C) Headache is accompanied by at least 1 of the following: (i) Ipsilateral conjunctival injection and/or lacrimation. (ii) Ipsilateral nasal congestion and/or rhinorrhea. (iii) Ipsilateral eyelid edema. (iv) Ipsilateral forehead and facial sweating. (v) Ipsilateral miosis and/or ptosis. (vi) A sense of restlessness or agitation. (D) Attacks have a frequency from 1 every other day to 8/day. Additionally, the headaches cannot attributed to another disorder. UMLS:C0009088