Headache
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The 1988 classification by the International Headache Society (IHS) first defined drug-induced headache as a specific disorder, belonging to secondary headaches, subtype 8.2 (headache induced by chronic substance use or exposure). In 2004 ICHD-II, this definition was replaced by medication-overuse headache (MOH). It was established that a definite diagnosis of MOH required the improvement of the disorder after cessation of medication overuse. ⋯ We therefore propose to continue to use the diagnosis of probable MOH to research aims. We also propose to modify the classification of MOH subforms according to the presence or absence of a dependence-producing property of overused drugs. This will allow to better analyze the role of the various medications in inducing chronic headache and the outcomes of treatments.