To figure out what causes your migraines, print the list below. Then check for triggers at the first signs of a headache. Review the list every few weeks or months to see if you can spot a pattern. Chances are, the items that get the most checks are your triggers.
American Headache Society: "Headache Hygiene Tips."
The International Headache Society: "Epidemiology of Headache."
The Migraine Trust: "Your Triggers."
National Headache Foundation: "Migraine."