The Difference Between Migraine Triggers and Causes (And Why It Matters)

For years, I kept a running list of my migraine triggers. Wine. MSG. Aged cheese. Bright lights. Skipping meals. Weather changes. The list kept getting longer, and my life kept getting smaller.

I was avoiding everything I could think of. And I was still getting attacks.

The problem wasn't that I had the wrong list. The problem was that I was thinking about triggers completely backwards. I thought if I could just avoid enough of them, the attacks would stop.

But that's not how migraine works because triggers aren't the cause. They're the burnt toast that sets off an already sensitive alarm.

The Smoke Detector Analogy

Think about a smoke detector in your kitchen. You burn some toast, and the alarm goes off. But the toast didn't make the alarm sensitive. The wiring did. The detector was already set to react at a certain level.

A migraine brain is an overly sensitive smoke detector. It's wired to react to things that other brains just filter out, bright lights, weather changes, stress, a skipped meal, a hormonal shift. Those are all burnt toast. They set off the alarm. But they didn't make the alarm sensitive in the first place.

That sensitivity comes from your genetics.

Migraine Is a Neurological Disease with Genetic Roots

Migraine is not caused by chocolate or wine or the weather. It's a neurological disease, and researchers have identified over 180 genetic variants that influence whether your brain develops this kind of reactivity.

Each variant on its own only increases your risk by a small amount. But they add up. They affect how your nerve cells communicate, how your blood vessels respond to changes, how your brain processes light and sound and pain, and how sensitive your trigeminal nerve pathway becomes.

When enough of these factors combine in one person, the result is a nervous system that overreacts. A smoke detector with a very low threshold.

"But Nobody in My Family Has Migraine"

I hear this constantly and I understand the confusion.

Genetics don't always show up the same way in every family member. You can carry the wiring for a sensitive smoke detector without it ever going off.

Your mom might have a slightly sensitive detector. Your dad might have one too. But neither of theirs is sensitive enough to actually trigger an alarm. Yours is. You got a combination from both of them that pushed the sensitivity just past the line.

Same thing with siblings. Your sister might have gotten a slightly different version of the wiring, and her detector stays quiet. Same parents. Same house. Just a different combination.

Researchers estimate that roughly 42% of what determines whether you get migraine comes from genetics. The rest comes from your environment and how your genes interact with your life. So it's not destiny, but it is the foundation.

Even if you're the only person in your family who deals with this, the wiring still came from them.

It's also worth noting that while genetics are the foundation for most people with migraine, some people develop it after a specific event, a head injury, a viral infection, significant trauma. These experiences can change how the brain processes pain and sensory information, essentially lowering the threshold even without a strong genetic predisposition. If your migraine started after a concussion or a severe illness, that doesn't mean the genetics explanation doesn't apply to you. It just means your brain's sensitivity was triggered through a different pathway.

Why This Reframe Changed Everything for Me

For a long time, I blamed myself. What did I eat. What did I do wrong. Why can't I just handle what everyone else handles.

Understanding the difference between triggers and causes meant I could finally stop asking those questions. My alarm is just set to go off sooner.

The triggers are real. They do set off the alarm. But they're not the cause. And once you understand that, you can stop spending all your energy avoiding burnt toast, and start focusing on what actually changes things.

Common Migraine Triggers (That Aren't Universal)

Triggers are highly individual. Just because red wine triggers attacks for one person doesn't mean it will for you. And just because chocolate is fine for someone else doesn't mean it won't be an issue for you.

That said, there are patterns that appear frequently across people with migraine:

Sleep related triggers: too little sleep, too much sleep (especially sleeping in on weekends), inconsistent sleep schedule, poor sleep quality, fragmented sleep.

Food and hydration triggers: skipped or delayed meals, dehydration, alcohol (especially red wine, though any type can be a trigger), aged cheeses, processed meats with nitrates or nitrites, artificial sweeteners, caffeine (both too much and caffeine withdrawal), MSG.

Hormonal triggers: menstrual cycle changes, particularly the estrogen drop before a period, ovulation, pregnancy, perimenopause and menopause, birth control, hormone replacement therapy.

Environmental triggers: bright or flickering lights, strong smells, barometric pressure changes, loud sustained noise, extreme heat or cold, high altitude.

Physical and lifestyle triggers: intense physical exertion (especially without buildup), poor posture or neck strain, eye strain from screens, travel and time zone changes, disrupted routine.

Stress related triggers: work and deadline stress, emotional stress, the letdown after stress ends (the classic "weekend migraine"), sensory overload, lack of recovery time.

Other triggers: certain medications, illness or infection, allergies and sinus issues, head injury or neck trauma.

The Important Part: Your Cup Was Already Half Full

This is where the smoke detector analogy connects to threshold.

You eat chocolate on a Tuesday after good sleep, regular meals, and low stress. Nothing happens. The following Friday, you eat the same chocolate after a poor night's sleep, a skipped lunch, and a stressful afternoon. Attack that evening.

The chocolate didn't change. Your threshold did.

When people blame a specific food or trigger, they're usually seeing the last drop that overflowed the cup, not the full picture of what was already inside. The chocolate was just the burnt toast that set off an alarm that was already primed to go off.

What You Can Actually Do About It

You can't rewire the detector. You can't change your genetics or undo the neurological sensitivity you were born with.

But you can raise the level at which your detector goes off. You can make it less reactive.

How? Through a framework used in headache medicine called SEEDS, Sleep, Exercise, Eat, Diary, and Stress. These are the foundations that most directly influence migraine threshold. Not by avoiding triggers, but by building a more stable baseline so your brain has more room before an attack starts.

This is not about avoiding every piece of toast for the rest of your life. It's about building a system that gives your brain more space before the alarm sounds.

If you want to go deeper on how to actually build these foundations, in the right order, at a pace your nervous system can handle, I put together a step by step guide called The Migraine Guide: 6 Steps to Fewer Attacks.

The Triggers Are Real — And So Is Your Threshold

I'm not saying triggers don't matter. They do. If red wine consistently triggers attacks for you, avoiding it is a completely reasonable choice.

But if you're avoiding fifteen different foods, never going outside on sunny days, and still getting frequent attacks, it's worth asking whether the problem is really the triggers, or whether it's your baseline threshold.

For most people with chronic migraine, the answer is threshold. When your cup starts each day already half full from poor sleep, irregular meals, chronic stress, and no recovery time, almost anything can be the final drop.

When you stabilize your foundations and your cup starts each day with more space, you'll often find that the same triggers that used to reliably cause attacks don't anymore. Or they do sometimes, but not always. Which tells you it was never really about the trigger, it was about how much room you had left.

A Final Thought

Understanding that migraine is a genetic neurological condition, not something caused by your choices or your failures, was one of the most important shifts I made in how I relate to this disease.

I didn't give myself migraine by eating the wrong foods or not managing stress well enough. I have migraine because my brain is wired differently. That wiring makes me more reactive to changes and stimuli that other brains handle without issue.

The triggers are real. They set off the alarm. But they're not the cause. And once you understand that, you can stop spending all your energy avoiding burnt toast and start focusing on what actually matters, building a more stable baseline so your detector has more room before it reacts.

This blog post is for educational purposes only and is not medical advice. Please consult your healthcare provider before making changes to your migraine treatment plan.