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Introduction
Also known as CDH, chronic daily headache consist a broad range of disorders which occur for more than 15 days in a month. It should happen at least daily for about 3months. Chronic daily headaches, in this case the primary variety, is divided into two categories based on period of occurrence.
The primary types of chronic daily headaches averaging more than 4 hours:
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Chronic migraine or transformed migraine
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Daily persistent headache
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Chronic tension headache
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Hemicrania continua
Those that last 4 hours and below:
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Chronic cluster headache
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Chronic paroxysmal hemicranias
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Short-lasting unilateral neuralgiform headache attacks with conjuctival injection and tearing.
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