Cluster Headache

**Definition:** A primary headache disorder that is characterized by severe, strictly unilateral PAIN which is orbital, supraorbital, temporal or in any combination of these sites, lasting 15-180 min. occurring 1 to 8 times a day. The attacks are associated with one or more of the following, all of which are ipsilateral: conjunctival injection, lacrimation, nasal congestion, rhinorrhea, facial SWEATING, eyelid EDEMA, and miosis. (International Classification of Headache Disorders, 2nd ed. Cephalalgia 2004: suppl 1)

**Tree numbers:** - C10.228.140.546.399.937.500

**Synonyms:** - Horton's Syndrome - Neuralgic Migraine - Chronic Cluster Headache - Ciliary Neuralgia - Cluster Headache Syndrome - Headache, Cluster - Horton Syndrome - Histamine Cephalgia