What are the most common — and overlooked — migraine triggers?

Most migraine patients can list two or three triggers from memory: red wine, missed sleep, hormones, particular foods. These are the obvious ones, and they matter. The triggers that are harder to spot — and often the ones that explain the unexplainable attack — sit at the system level: sleep variability, skipped meals, neck loading, mood, and barometric change. Recognising them, and pulling on the levers that are within your control, can meaningfully reduce attack frequency.

What "trigger" actually means

The current scientific understanding is that migraine is a disorder of brain excitability, not a brain disease set off by individual food items. Triggers are best thought of as factors that lower the threshold for an attack rather than directly causing it. The brain has a daily ceiling of tolerance; if you stack enough trigger-load over 48–72 hours, you push above the ceiling and the attack starts. This is why patients describe "perfect storm" days: a poor sleep + a missed lunch + a neck stiffness + a stressful meeting + a glass of wine, where any one of those alone would not have triggered an attack (Pellegrino et al., 2018).

Top tier 1: well-documented triggers

• Skipped meals and low blood glucose — One of the most replicable triggers in the literature. The American Migraine Prevalence and Prevention study identified meal-skipping as a top-three reported trigger in 53% of patients (Kelman, 2007).
• Sleep variability — Both sleeping too little and sleeping too much can trigger attacks. The variability matters more than the absolute hours. People who sleep 6 h on weekdays and 9 h on weekends have a higher attack rate than people who sleep a consistent 7 h every night (Houle et al., 2017).
• Stress and the post-stress "let-down" period — In a prospective diary study, perceived stress was followed by attacks in the next 6–18 hours; the highest-risk window is the day after a peak-stress event, when cortisol falls (Lipton et al., 2014).
• Hormonal change — Oestrogen withdrawal in the pre-menstrual phase drives the well-known "menstrual migraine" pattern in around 50% of women with migraine (MacGregor, 2015).
• Dehydration — A 1.5–2% reduction in body water raises attack risk in a dose-dependent way (Spigt et al., 2012).

The often-overlooked tier 2 triggers

Neck and jaw input

Patients are routinely told their migraine is "all in the brain" and that their neck is unrelated. The evidence does not agree. Around 70% of migraineurs have concurrent neck stiffness, often before the headache phase begins, and treating the upper cervical spine reduces attack frequency in randomised trials (Cerritelli et al., 2017). The trigeminocervical nucleus — where neck and jaw nerves converge with the trigeminal nerve — is now well-established as a peripheral driver of central sensitisation in migraine.

Caffeine — both ways

Moderate caffeine can abort an early attack. But chronic high-dose caffeine (more than 3 cups of strong coffee per day) increases attack frequency, and weekend caffeine withdrawal is one of the commonest weekend-headache triggers (Mostofsky et al., 2019).

Bright, blue, and flicker light

Particularly fluorescent overheads and unflickered LED displays. A 2018 study showed melanopsin-sensitive blue-spectrum light at 480 nm was the strongest aura-promoting wavelength (Noseda et al., 2018). Migraine glasses with FL-41 tint reduce photophobia and may reduce attack frequency.

Barometric pressure

Diary studies consistently show a small but real effect of falling barometric pressure on migraine onset. You cannot change the weather, but knowing it is a contributor helps reduce self-blame on those days.

Posture and screen ergonomics

Prolonged forward head posture loads the upper cervical extensors and pulls the dura; in a sensitised migraine brain this peripheral input contributes to the attack threshold (Visscher et al., 2002).

What about food triggers?

Most food triggers have weaker evidence than patients think. The strongest signals in the literature are aged cheeses and cured meats (tyramine, nitrites), red wine, monosodium glutamate, and artificial sweeteners (aspartame). Even for these, the response is highly individual. The most reliable way to identify your own food triggers is a structured headache diary kept for 8–12 weeks, not an elimination diet (Martin and Vij, 2016).

How to use this information

The aim is not to live in fear of a long trigger list. It is to identify your top three "stackable" levers and keep them stable:

1. Eat regularly, with a protein-containing breakfast and lunch.
2. Keep sleep within a 1-hour window seven days a week.
3. Hydrate to a baseline of 30 ml per kg per day, more in hot weather or exercise.
4. Manage neck and jaw input with targeted physiotherapy when stiffness is present.
5. Recognise and decompress the post-stress "let-down" window with planned recovery rather than relief-celebration alcohol.

A consistent 8-week headache diary, recording attacks alongside the variables above, is one of the most useful tools in migraine medicine. Patterns that look mysterious in your head become obvious on paper, and the highest-yield intervention almost always identifies itself.

The takeaway

If you have been told your migraines are simply "stress" or "hormonal", you have been undersold. Triggers are stackable, modifiable, and far more numerous than the popular list suggests. Looking at the system — sleep regularity, meal timing, hydration, neck and jaw load, light exposure, and the post-stress window — usually identifies two or three high-yield levers that, pulled together, can reduce attack frequency by 30–50% within three months without medication change.