Healthline says research has shown it is more likely a combination of factors that trigger migraine. Triggers vary from person to person and include:

bright lights
loud sounds
powerful odors
stress, anxiety, relaxation after a period of stress
changing weather
alcoholic beverages, especially red wine
too much caffeine or withdrawal from caffeine
foods containing nitrates (hot dogs, luncheon meats)
foods containing monosodium glutamate, also known as MSG (fast foods, seasonings, spices, broths)
foods containing tyramine (aged cheeses, hard sausages, smoked fish, soy products, fava beans)
artificial sweeteners

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http://www.allaboutvision.com/condit...r-migraine.htm