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. |