Food triggers Alcoholic beverages Sodium nitrite-laden meat (eg, hot dogs, deli meats) MSG (monosodium glutamate) Aspartame (artificial sweetener, Nutrasweet) Hunger (skipped meals or fasting) Physical triggers Too much or too little sleep Head trauma Physical exertion Hormonal triggers Menstruation (including premenstruation) Psychological triggers Stress Poststress activity Environmental triggers Glare/bright flashing or flickering lights (includes fluourescent [...]