Headache Disorders are among the most common disorders of the nervous system. Primary Headache disorders, such as migraine, tension-type headache, cluster headache, and the so-called chronic daily headache syndrome, can cause substantial levels of disability. Headache can also occur as a symptom of a considerable number of other conditions. There are effective treatments for all types of headache.

Source: http://www.who.int/topics/headache_disorders/en/

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