A migraine headache is a form of vascular headache. Migraine headache is because by vasodilatation (enlargement of blood vessels) that causes the let go of chemicals from nerve fibers that coil approximately the large arteries of the brain.
Enlargement of these blood vessel stretches the nerve that coil around them and causes the nerves to release chemicals.
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The chemicals cause irritation, pain, and further enlargement of the artery.
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