Most simply stated, chronic daily headache (CDH) is headache, not Migraine, that occurs 15 or more days a month.

Doctors divide chronic daily headache into a number of subcategories:

• Primary CDH: attributable to an underlying disorder
  • Shorter than four hours duration
    • chronic cluster headache
    • chronic paroxysmal hemicrania
  • Longer than four hours duration
    • chronic tension-type headache
    • chronic Migraine (sometimes called transformed Migraine)
    • new daily persistent headache
    • hemicrania continua
• Secondary CDH: not attributable to an underlying disorder

Additionally, each of those types is typically subdivided into two groups, with and without medication overuse as it has been found that rebound headaches, aka medication overuse headaches, often contribute to headache or Migraine becoming chronic. Interestingly, studies have shown that medication overuse is less common patients who are treated by headache and Migraine specialists.

Studies have also shown that CDH patients were more likely to snore and report problems with sleep than episodic headache and Migraine patients.

Studies of the populations of the U.S. and Europe have shown that 4-5% of the population have daily or nearly daily headaches or Migraines.

See these related articles:

• Tension-Type Headache, Most Common of All
• Anatomy of a Migraine
• Anatomy of a Cluster Headache
• What Is Hemicrania Continua?
• New Daily Persistent Headache: What Is It?
   

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Resources:

Silberstein, Stephen D.; Lipton, Richard B.; Goadsby, Peter J.; Smith, Robert T. "Headache in Primary Care." Isis Medical Media. 1999.

Young, William B.; Silberstein, Stephen D. "Migraine and Other Headaches." AAN Press. 2004.

Goadsby, Peter J.; Silberstein, Stephen D.; Dodick, David W. "Chronic Daily Headache for Clinicians." BC Decker Inc. 2005.

Published April 19, 2006
© Teri Robert