causes of  migraines
1 Some people who suffer from migraines can clearly identify triggers or factors that cause the headaches such as allergies, light and stress.  Some people get a warning prodrome, preceding the onset of a migraine headache.
1 Migraine headache is a result of specific changes within the brain. It causes severe head pain that is often accompanied by sensitivity to light, sound, or smells. 2  Common symptoms of migraine are:  Eye pain.