Zillion: There is an incredibly long list of causes. Neurologists deal with them on a daily basis.
Answered 10/3/2016
6.1k views
Many Different: There are many different causes for headaches, both known and unknown. Muscle tension or stress headaches are caused by the muscles around the skull tightening. Some headaches are caused by pressure inside the brain or skull. Some are caused by infection or damage to a nerve around the head. Many others are unknown.
Answered 10/3/2016
6.1k views
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