There is no known cause for migraine, although most people with it are genetically predisposed to migraine.
Meanwhile, Migraines are believed to be end results to a mixture of environmental and genetic factors. Changing hormone levels may also play a role, as migraines affect slightly more boys than girls before puberty and two to three times more women than men. The risk of migraines usually decreases during pregnancy. The underlying mechanisms are not fully known. They are, however, believed to involve the nerves and blood vessels of the brain.
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