NIH: Cluster headaches are severe type of headaches which often occur in middle of the night and affect men a lot more commonly compared to females. The exact mechanism isnt known. You can find a lot of information on http://www.Nlm.Nih.Gov/medlineplus/ency/article/000786.Htm nih or national institute of health has information about most medical problems and will give you details about it.
Answered 10/3/2016
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Cluster HA resources: Make sure the diagnosis is right first! Here are some helpful resources http://www.neurocuro.com/cluster-headache/ http://www.mayoclinic.org/diseases-conditions/cluster-headache/basics/definition/con-20031706 http://www.nlm.nih.gov/medlineplus/ency/article/000786.htm
Answered 5/19/2016
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