Episodic cluster headaches are the most common
type of cluster headaches. People with episodic cluster headaches have cluster
periods of 1 to 3 months when they are prone to having headaches. The cluster
periods are followed by headache-free periods (remissions) of 6 months or more.
About 90 out of 100 people who have cluster headaches have episodic cluster
Chronic cluster headaches are
those that occur during a period of at least 12 months without a headache-free
period (remission) or when remissions last less than one month.2 About 10 out of 100 people who have cluster headaches have chronic
Evans RW (2009). Headache. In EG Nabel, ed., ACP Medicine, section 11, chap. 8. Hamilton, ON: BC Decker.
Headache Classification Subcommittee of the
International Headache Society (2004). International classification of headache
disorders: 2nd ed. Cephalalgia, 24(Suppl 1):
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