The clinical and public health implications and risks of widening the definition of chronic migraine
Background: The definition of chronic migraine has long been debated. Recently, it was suggested to define subjects with at least 8/migraine days as chronic migraine; that is, incorporating so-called high frequency episodic migraine (eight or more migraine days but less than 15 headache days per month). Methods: We addressed the possible problems that might arise based on this proposal accounting for clinical, pathophysiological, impact and public health aspects.