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Headaches can be attributed to many different substances. Some of these include alcohol, NO, carbon monoxide poisoning, cocaine, caffeine and monosodium glutamate. Chronic use of certain medications used to treat headaches can also start causing headaches, known as medication overuse headaches. Headaches may also be a symptoms of medication withdrawal. ==Classification== These headaches have been further sub classified by the ICHD2 into *Headaches induced by acute substance use or exposure *Medication overuse headaches (MOH) *Headaches attributed to chronic medication use *Headaches attributed to substance withdrawal 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Headache attributed to a substance or its withdrawal」の詳細全文を読む スポンサード リンク
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