A cluster headache is one-sided head pain that may involve tearing of the eyes and a stuffy nose. Attacks occur regularly for 1 week to 1 year, separated by long pain-free periods that last at least 1 month, possibly longer.
See also:
Histamine headache; Headache - histamine; Migrainous neuralgia; Headache - cluster
Cluster headaches are a fairly common form of
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Source: ADAM Encyclopedia
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