A migraine is a common type of headache that may occur with symptoms such as nausea, vomiting, or sensitivity to light (including vision disturbances). In many people, a throbbing pain is felt only on one side of the head. Migraine headache is caused by vasodilatation (enlargement of blood vessels). Enlargement of these blood vessels stretches the nerves that coil around them and causes the nerves to release chemicals. The chemicals cause inflammation, pain, and further enlargement of the artery. Migraine is three times more common in women than in men.
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