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Table 2 ICHD-II criteria for episodic and chronic cluster headache

From: Cluster headache

3.1.1 Episodic cluster headache
   A. All fulfilling criteria A through E of 3.1
   B. At least two cluster periods lasting from 7 to 365 days and separated by pain free remissions of > 1 month.
3.1.2 Chronic cluster headache
   A. All fulfilling criteria A through E of 3.1
   B. Attacks recur for > 1 year without remission periods or with remission periods lasting < 1 month.