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.
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.footnote 1
Headache Classification Subcommittee of the International Headache Society (2004). International classification of headache disorders: 2nd ed. Cephalalgia, 24(Suppl 1): 9–160.
ByHealthwise Staff Primary Medical ReviewerAnne C. Poinier, MD - Internal Medicine Martin J. Gabica, MD - Family Medicine Kathleen Romito, MD - Family Medicine Specialist Medical ReviewerColin Chalk, MD, CM, FRCPC - Neurology