Abstract
To our patients, their families, and treatment providers who may not be headache specialists, chronic daily headache (CDH) would appear to refer to headache disorders marked by the presence of daily pain over an extended period of time. To the headache specialist, in contrast, CDH represents a family of headache disorders in which pain occurs from 15 to 30 days each month [1], now reflected in the International Headache Society (IHS) criteria for chronic migraine (CM) or chronic tension-type headache [2]. The IHS classification does not distinguish between daily CM and intermittent CM marked by at least some pain-free days [3]. Research studies and clinical reports of the diagnostic entities subsumed under CDH often include patients with pain-free days and those with true daily pain.
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