What is the frequency of progression of chronic cluster headache (CH)?

Updated: Jun 07, 2019
  • Author: Michelle Blanda, MD; Chief Editor: Tarakad S Ramachandran, MBBS, MBA, MPH, FAAN, FACP, FAHA, FRCP, FRCPC, FRS, LRCP, MRCP, MRCS  more...
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About 80% of patients with episodic CH maintain the episodic form of the disorder. In 4-13%, episodic CH eventually transforms into chronic CH. Intermediate (mixed) forms may also develop. Prolonged, spontaneous remissions occur in as many as 12% of patients, particularly in those with episodic CH. Chronic CH is more relentless and may persist in this form in as many as 55% of cases. Less frequently, chronic CH may remit into an episodic form.

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