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noun, Pathology.
a type of severe recurrent headache associated with dilated carotid arteries and the release of histamine, characterized by sudden attacks of intense pain behind the nostril and eye on one side and accompanied by runny nose, tearing, and flushed skin.

cluster headache clus·ter headache (klŭs’tər)
A recurring headache marked by severe pain in the eye or temple on one side of the head, usually occurring in males. Also called erythroprosopalgia, histaminic headache.
cluster headache
A recurring headache, most common in males, characterized by severe pain in one eye or the adjacent temple, watering of the eye, and runny nose.


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