· Hormonal changes in women
· Certain foods: alcohol, aged cheeses, chocolate, caffeine, large quantities of MSG, and aspartame.
· Sensory stimuli; bright lights, unusual odors
· Changes in sleep and wake patterns
· Physical factors, exertion
· Changes in environment; weather, season, altitude, time zone, barometric pressure
· Certain medications
Neurology Now, September/October 2008