What is the migraine threshold model?

The migraine threshold model describes migraine as a dynamic, state-dependent system. Think of your system as a bucket that can hold a certain amount of load - sleep disruption, stress, histamine, hormonal shifts, dehydration - before it overflows into a migraine. The threshold is not fixed; it shifts daily based on your total load and capacity. This explains why the same trigger causes an attack one day but not another.

Why do migraines happen randomly?

Migraines don't happen randomly - they feel random because we tend to look for a single trigger rather than total system load. On any given day, multiple factors (sleep quality, hydration, hormones, stress, histamine, barometric pressure) combine to determine how close you are to threshold. A trigger that was harmless yesterday can tip you over today because the background load was different.

What fills the migraine bucket?

Load factors that fill the bucket include: sleep disruption, stress and nervous system activation, histamine from food or mast cells, hormonal shifts (especially estrogen withdrawal), dehydration or low sodium, inflammation, and medication overuse. These are cumulative - each one adds to total load, and when combined load exceeds your current capacity, a migraine is triggered.

What determines migraine threshold capacity?

Your threshold capacity - how big the bucket is on a given day - is determined by factors like circulation and blood volume, electrolyte balance, glymphatic drainage (brain waste clearance during sleep), autonomic nervous system stability, hormonal state, and genetic enzyme capacity (like DAO for histamine clearance). These capacity factors fluctuate, which is why your resilience to triggers changes daily.

Why does the same trigger sometimes cause a migraine and sometimes not?

Because the trigger is not the whole story - it's the final push. Whether a trigger causes an attack depends on how much load is already in the bucket and how much capacity you have that day. Wine might cause a migraine when you're sleep-deprived, premenstrual, and stressed, but not when you're well-rested, mid-cycle, and relaxed. The trigger didn't change - your threshold position did.

Foundational Concept

Migraine is a dynamic threshold system.

Why the same trigger causes an attack one day - and nothing the next.

Last updated March 26, 2026

Researchers describe migraine as a sensory threshold disease - people with migraine have lower, more fluctuating sensory thresholds than people without. The threshold isn't fixed; it shifts daily.

The Model

Think of your system as a bucket.

The bucket holds a certain amount of stress, load, and disruption before it overflows. When it overflows, you get a migraine.

The same trigger - chocolate, wine, weather - can overflow the bucket one day and be harmless the next, depending on how full it already was.

Clinical and patient-education sources describe the migraine threshold as a tipping point: a person can tolerate several triggers up to a limit, but when enough changes stack together, an attack becomes likely.

The Illustration

The layers that fill your bucket.

Each layer below contributes load. The dashed line is your threshold - the bucket's edge.

Today's Trigger

Wine, weather change, missed meal

+15%

THRESHOLD

The Threshold

The brain's capacity to tolerate load before activating migraine physiology. This is the "bucket size."

← Pain threshold

Sleep Disruption

Poor quality, irregular timing

+20%

Stress / Nervous System Load

Anxiety, overstimulation, deadlines

+15%

Histamine / Inflammatory Load

Diet, allergies, gut issues

+10%

Histamine and neurogenic inflammation can sensitize trigeminal pathways and interact with other triggers, effectively lowering the threshold for an attack.

Nutrient Gaps / Supplement Inefficiency

Wrong forms, poor absorption, missing cofactors

+10%

Circulation / Autonomic Load

Orthostatic intolerance, blood volume instability, vascular tone

+10%

Cerebral perfusion changes - including phases of hypoperfusion and hyperperfusion in some migraine subtypes - support the idea that vascular tone and blood-flow regulation can act as capacity constraints in the system.

Electrolyte & Hydration

Sodium balance, fluid retention, blood volume

+5%

Brain Drainage (Glymphatic System)

Poor brain waste clearance, neck tension

+5%

Hormonal Shifts

Estrogen drops, cycle timing, perimenopause

+15%

Fluctuations and sharp drops in estrogen have repeatedly been linked to increased migraine frequency and lower attack thresholds, particularly around menstruation and perimenopause.

Baseline capacity

Total load in this example: 105% - meaning the system is already past threshold before any additional trigger arrives.

When the Threshold Is Exceeded

When cumulative load crosses the threshold, the brain activates migraine physiology:

• Trigeminal nerve fires
• CGRP released
• Vascular signaling shifts
• Cortical spreading depression (sometimes)
• Migraine symptoms begin

The Goal

Create space in the system.

The goal isn't to eliminate triggers. It's to lower the baseline load so that when triggers happen, they don't overflow the bucket.

Same trigger - different outcome

Before

95% baseline

Wine at dinnerMigraine
Weather changeMigraine
Skipped mealMigraine

After

50% baseline

Wine at dinnerFine
Weather changeFine
Both at onceMild symptoms

The Approach

Address one layer at a time.

Instead of chasing triggers, the Migraine Detective Method addresses layers systematically - starting with the ones that contribute the most load for your specific pattern.

Identify which layers are most full

Is it sleep? Stress? Histamine? Hormones? Everyone's bucket is filled differently.

Address the highest-impact layer first

A 20% reduction in one layer creates more headroom than 5% in four layers.

Observe how the system responds

As load decreases, triggers that once caused attacks become tolerable.

Move to the next layer

Continue building resilience until you have enough buffer for life's normal variability.

The Journey

From fragile to resilient.

Starting Point

Frequent attacks, unpredictable triggers

Bucket nearly full at baseline

Layer 1 Addressed

Attacks less severe, some become tolerable

Layer 2 Addressed

Frequency drops, recovery faster

Layer 3 Addressed

Former triggers now tolerable

Resilient State

🎉

Yay - you made it! Clear head most days, triggers rarely overflow.

Bucket has room to absorb life's variability.

Why It Matters

Why this changes everything.

Trigger-chasing fails.

It focuses on the final drop that overflows the bucket - not the layers that filled it 90% of the way.

Medication alone often fails.

It treats the overflow without reducing the baseline load.

The threshold model works.

It addresses the actual physiology - creating space so triggers can be absorbed without pain. Whether that means addressing vascular underfill, nutrient gaps, or acute treatment mismatch.

Next Step

Figure out which layer to address first.

You can't reduce baseline load without first knowing which layers are filling your bucket. Pick a starting point.

Always free

Start tracking in the Telegram voice tracker.

Talk to the bot for 30 seconds a day. We surface which layers are stacking - so you know what to address first.

Open the tracker

2-minute test

Or start the Migraine Pattern Test.

A short assessment that points to which physiological layer is most likely driving your pattern.

Take the test

Educational pattern exploration, not medical advice.

References

– Ikumi N, et al. Migraine understood as a sensory threshold disease. J Headache Pain. 2019. PubMed
– Sebastianelli G, et al. Insights from triggers and prodromal symptoms on how migraine attacks start: The threshold hypothesis. Cephalalgia. 2024. Abstract
– Dreier JP, et al. Understanding migraine using dynamical network biomarkers. Int J Neurol (review). PDF
– Migraine Australia. The migraine threshold. Patient education page explaining the bucket/threshold concept. migraine.org.au
– American Headache Society. Position statements and educational resources on migraine mechanisms and triggers. americanheadachesociety.org

Educational framework for understanding migraine patterns - not medical advice. Consult your healthcare provider for diagnosis and treatment.