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What is the definition of cluster headaches?

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Cluster headaches are headaches that have a characteristic grouping of attacks; cluster headaches occur one to three times per day during a cluster period, which may last two weeks to three months. Cluster headaches are the least common type of primary headache. These headaches are considered a vascular type of headache, like migraines. The pain of a cluster headache is generally very intense and severe.

From: Migraine and Headache Glossary WebMD Medical Reference

SOURCES: Mayo Clinic. National Institute of Neurological Disorders and Stroke.

Reviewed by Nayana Ambardekar on February 13, 2019

SOURCES: Mayo Clinic. National Institute of Neurological Disorders and Stroke.

Reviewed by Nayana Ambardekar on February 13, 2019

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