What are the classifications of 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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CH may be usefully classified into 2 main forms as follows:

  • Episodic CH, in which at least 2 cluster phases lasting 7 days to 1 year are separated by a cluster-free interval of 1 month or longer

  • Chronic CH, in which the clusters occur more than once a year without remission or the cluster-free interval is shorter than 1 month

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