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They are more common in men than women. The headaches can occur at any age but are most common in adolescence and middle age.Scientists do not know exactly what causes cluster headaches, but they appear to be related to the body's sudden release o...

Source:ADAM

Date:June 19, 2008

Cluster Headache

Decreased blood oxygen levels(hypoxemia) can also act as a trigger, particularly during the night when an individual is sleeping. Interestingly, the triggers do not cause cluster headaches during remission periods.The primary cluster headache symp...

Source:Gale Encyclopedia of Medicine

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Cluster Headaches : Causes

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