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Tension-type headache (TTH) is the most prevalent type of headache across all age groups worldwide. TTH is common, disabling, and associated with medical and psychiatric comorbidities. This review will focus on the epidemiologies of episodic and chronic TTH in various age groups, factors associated with progression and remission, comorbidities, and the burden of TTH.

New daily-persistent headache (NDPH) and chronic tension-type headache (CTTH) are two forms of primary chronic daily headache of long duration that often are similar in their headache manifestations. NDPH distinguishes itself from CTTH and the other forms of chronic daily headache by its continuous head pain from onset. However, despite formalized criteria that specify NDPH must resemble the acute onset of a headache identical to that of CTTH, NDPH commonly has migraine features. Here, we review the available literature on NDPH and compare its clinical features, epidemiology, prognosis, inciting factors, and treatment to CTTH.