Although migraine headaches are thought to be the result of an excessive dilation of blood vessels in the head, there are various hypotheses as to why this happens. Many sufferers know what triggers their attacks, for example certain foods, but others suffer randomly. Traditionally used to treat headaches, several studies have found that the herb feverfew, found in MigraHerb, may help prevent and treat migraines. Find our more about Migraine by visiting the Migraine Action Website.