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.