Identifying Migraine Triggers: When the Culprit Is Really the First Symptom

Key Takeaways:

• In a survey of 1,207 people with migraine, 75.9 percent reported triggers, most often stress (79.7 percent), hormonal changes in women (65.1 percent), skipped meals (57.3 percent), weather (53.2 percent), and disturbed sleep (49.8 percent).
• When 27 people who said bright light or strenuous exercise reliably set off their migraine with aura were deliberately exposed to those triggers, only 3 (11 percent) developed an aura attack, and none did after light stimulation.
• In a prospective electronic diary study, people who noticed premonitory symptoms such as tiredness, poor concentration, and a stiff neck correctly predicted their headache from 72 percent of those warnings.

As autumn brings its first cold fronts, shorter days, and a busier calendar, many people with migraine brace for a rough stretch and start scanning for culprits. Asking about migraine triggers is reasonable, because most people with migraine believe they have them. In a survey of more than 1,200 patients, three in four reported triggers, led by stress, hormonal shifts in women, skipped meals, weather, and poor sleep, with alcohol, odors, light, and particular foods further down the list. The trouble is that belief and proof are different things. When researchers took 27 people with migraine with aura who were confident that bright or flickering light or hard exercise set off their attacks, and then deliberately exposed them in the laboratory, only three developed an aura attack. None did after light stimulation, and four of the twelve who exercised developed a migraine. A trigger is something that makes an attack more likely, not a switch that guarantees one, and the human mind is very good at finding a pattern in whatever happened just before the pain began.

Part of the confusion comes from the way a migraine actually starts. The headache is not the beginning of the attack; for many people it is the middle. Hours before the pain, a premonitory phase can bring fatigue, yawning, difficulty concentrating, and neck stiffness. In an electronic diary study that recorded these symptoms as they happened, people who noticed premonitory symptoms correctly predicted their headache from 72 percent of those warnings, and tiredness was the most common. Imaging has begun to show where this starts. A patient scanned every day for thirty days showed altered activity in the hypothalamus, the brain’s regulator of sleep, appetite, and daily rhythm, during the 24 hours before each attack. If the attack is already under way when fatigue or a change in appetite appears, then the nap, the snack, or the bright screen that followed can look like the cause when it was really the consequence. This is more than a hunch. In a 2025 study of 632 people with migraine, those who named bright light as a trigger were nearly three times as likely to report light sensitivity in their premonitory phase, and those who named loud noise more than four times as likely to report premonitory noise sensitivity, suggesting that some perceived triggers are early signs of an attack already in motion. Stress shows a twist of its own: in another diary study, the level of stress was not generally linked to attacks, but a drop in stress from one evening to the next raised the odds of migraine over the following 6 to 18 hours roughly 1.5- to 1.9-fold, the familiar weekend or vacation headache.

How do you identify your real migraine triggers?

The most reliable tool is a prospective diary kept for at least one to two months, written daily rather than reconstructed after an attack. Record sleep timing, meals and fluids, alcohol, menstrual days, exercise, stress level, and the weather, and, just as important, any early symptoms such as yawning, fatigue, a stiff neck, or cravings, noted with the time they began. Then look backward from each attack and ask two questions: did this exposure precede attacks more often than it preceded ordinary days, and did it come before or after the first warning signs? A factor that appears before most attacks and rarely otherwise, such as a skipped lunch or a short night, is a trigger worth managing with regular meals and a steady sleep schedule. Something that only shows up once the premonitory phase has begun is better treated as an early warning, and a well-recognized prodrome can be the signal to take acute medication earlier. Weather is one of the most commonly reported triggers, but it cannot be avoided, and a diary is the only way to know whether a given front truly matters for you. The goal is fewer unnecessary restrictions, not a longer list of foods to fear.

References:

1. Kelman, L. (2007). The triggers or precipitants of the acute migraine attack. Cephalalgia, 27(5), 394-402.
2. Hougaard, A., Amin, F. M., Hauge, A. W., Ashina, M., & Olesen, J. (2013). Provocation of migraine with aura using natural trigger factors. Neurology, 80(5), 428-431.
3. Giffin, N. J., Ruggiero, L., Lipton, R. B., Silberstein, S. D., Tvedskov, J. F., Olesen, J., et al. (2003). Premonitory symptoms in migraine: An electronic diary study. Neurology, 60(6), 935-940.
4. Schulte, L. H., & May, A. (2016). The migraine generator revisited: Continuous scanning of the migraine cycle over 30 days and three spontaneous attacks. Brain, 139(Pt 7), 1987-1993.
5. Lipton, R. B., Buse, D. C., Hall, C. B., Tennen, H., Defreitas, T. A., Borkowski, T. M., et al. (2014). Reduction in perceived stress as a migraine trigger: Testing the “let-down headache” hypothesis. Neurology, 82(16), 1395-1401.
6. Thuraiaiyah, J., Christensen, R. H., Al-Khazali, H. M., Wiggers, A., Ashina, M., & Ashina, H. (2025). Overlap between perceived triggers, premonitory symptoms and symptom persistence across migraine phases: A REFORM study. Cephalalgia, 45(8), 3331024251364234.