Chronic daily headache

Chronic daily headache (CDH) is not a specific headache type, but a syndrome that encompasses other primary headaches. The term “chronic” refers either to the frequency of headaches or to the duration of the disease, depending upon the specific headache type.
With headache subtypes of long duration (ie, four hours or more), “chronic” indicates a headache frequency of 15 or more days a month for longer than three months in the absence of organic pathology. These headache subtypes are:
Chronic migraine headache
Chronic tension-type headache
Medication overuse headache
Hemicrania continua
New daily persistent headache
With headache subtypes of shorter duration (ie, less than four hours), “chronic” refers to a prolonged duration of the condition itself without remission. The headache subtypes in this category are the following:
Chronic cluster headache
Chronic paroxysmal hemicrania
Hypnic headache
Short-lasting unilateral neuralgiform headache attacks
Primary stabbing headache
The worldwide prevalence of CDH among adults is approximately 4 percent. Most patients with CDH have either chronic tension-type headache or chronic migraine.
The diagnosis of CDH is suspected on the basis of a compatible headache history. Other disorders causing secondary headache must be excluded.
The management of CDH depends on the specific headache type and the presence or absence of medication overuse.

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