| cluster h. |
a headache, possibly a type of migraine, characterized by attacks of unilateral excruciating pain over the eye and forehead, with temperature elevation, lacrimation, and rhinorrhea; attacks last from 15 minutes to about an hour and tend to occur in clusters, sometimes a few times a day for two to eight weeks followed by months or years without occurrence. Because attacks identical to the spontaneous attacks may be induced in sufferers by subcutaneous injection of histamine diphosphate, it is also known as histamine cephalalgia or h. See also chronic paroxysmal hemicrania, under hemicrania. Called also Horton's disease or syndrome, migrainous neuralgia, and vasomotor h.
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