New daily persistent headache.

Chronic daily headache, defined as headache on 15 days or more per month for more than three months, is covered generally in another section of this supplement. However, because the syndrome of “new daily persistent headache” (NDPH) is so clinically distinct (table 1), and has an interesting range of secondary possibilities that are curable, we have elected to highlight the problem here. This is not to imply any linked pathophysiology but simply to highlight what is a clinically useful concept. From a nosological point of view most of what is covered here could be placed in the various parts of the classification system of the International Headache Society. It serves both patients and clinicians to highlight this syndrome because the implications of missing the diagnosis can be so profound. NDPH can have both primary and secondary forms (table 2). More general texts address the many surrounding issues of headache diagnosis and management. 4