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Headaches and Pain

Headache disorders, characterized by recurrent headache, are among the most
common disorders of the nervous system. Headache itself is a painful and disabling
feature of a small number of primary headache disorders, namely migraine, tension-
type headache, and cluster headache. Headache can also be caused by or occur
secondarily to a long list of other conditions, the most common of which is medication-
overuse headache. For more information, please visit

http://www.who.int/news-room/fact-sheets/detail/headache-disorders.