Long-term Prognosis of Cluster Headache: a Retrospective Cohort Study

Cluster headache is a syndrome characterized by disabling headache and accompanying autonomic symptoms. Despite cluster headache is called "suicide headache", its natural history has not been well investigated. The investigators aimed to investigate its disease course, overall prognosis, and treatment pattern in retrospective cohort.

Inclusion Criteria:

• Patients who were diagnosed as cluster headache
• More than 5 years after the first visit

Exclusion Criteria:

• Subjects who refused the telephone visit