What are chronic daily headaches of long duration

What are chronic daily headaches of long duration? 

Chronic daily headaches are the primary headache disorders in which patients experience headaches lasting 4 or more hours per day (without treatment), 15 or more days a month for 3 or more months.

This disorder affects 3% to 5% of the worldwide population.

These headaches include chronic migraine, chronic tension-type headache, new daily persistent headache, and hemicrania continua.

In contrast, chronic daily headaches of short duration (headaches lasting less than 4 hours per day untreated) are rare and include chronic CH, chronic paroxysmal hemicrania, and short-lasting unilateral neuralgiform headache attacks.

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