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What is linked to cluster headaches?

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Attacks appear to be linked to the circadian rhythm, your body's 24-hour clock. They happen so regularly, generally at the same time each day, that they've been called "alarm clock headaches." One will often wake you up an hour or two after you go to bed. Nighttime attacks can be more severe than the daytime ones.

From: Cluster Headaches WebMD Medical Reference

SOURCE: 

Mayo Clinic.

Reviewed by Melinda Ratini on September 9, 2018

SOURCE: 

Mayo Clinic.

Reviewed by Melinda Ratini on September 9, 2018

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What else can happen if you have a cluster headache?

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