Could Mycotoxins Be Contributing to Migraines?

Migraines are one of the most common—and, let’s be honest, most frustrating—conditions I see in clinical practice. They have a talent for showing up at the worst possible time: before an important meeting, during a family event, or precisely when someone has finally planned a relaxing weekend.

At the same time, I work with many patients who have mycotoxin illness.

Over the years, I have noticed that these two problems often overlap. Not in every case, of course, but often enough that it has made me pay attention.

In my own practice, I have seen patients with chronic migraines improve after we address significant mold exposure and the broader clinical effects associated with mycotoxins. That does not mean mycotoxins are the cause of every migraine. Migraine is a complex condition with many moving parts, and it rarely tells us exactly why it showed up.

Still, the overlap is clinically interesting, and the biology offers several plausible explanations for why mycotoxins could lower the migraine threshold in susceptible people.

What Does the Research Actually Show?

At this point, there are no high-quality randomized clinical trials showing that treatment directed specifically at mycotoxin exposure is an established therapy for migraine.

What we do have is a combination of:

• Human observational research showing an association between damp or mold-affected buildings and headache symptoms

• Experimental research demonstrating that several mycotoxins can affect the nervous system

• Strong migraine literature showing that oxidative stress, mitochondrial dysfunction, neuroinflammation, and altered neuronal excitability are involved in migraine biology

These pieces do not prove causation. Biology is rarely kind enough to hand us a tidy “Problem Solved” sticker.

But together, they create a reasonable scientific hypothesis.

The question becomes:

Could mold or mycotoxin exposure be one of the factors lowering a person’s migraine threshold?

In some patients, I believe the answer is YES.

Migraine Is More Than a Headache

Migraine is not simply a problem of dilated blood vessels, even though that was the traditional explanation for many years.

It is a complex neurologic disorder involving the trigeminal nervous system, CGRP signaling, altered neuronal excitability, mitochondrial function, oxidative stress, and neuroinflammatory pathways.

In other words, migraine is not “just a headache.” It is more like a highly coordinated, very inconvenient neurologic event—with excellent timing and absolutely no regard for your calendar.

A person’s migraine threshold can be influenced by many factors, including:

• Genetics

• Hormonal changes

• Poor sleep

• Stress

• Dehydration

• Blood-sugar changes

• Nutrient deficiencies

• Medications

• Allergies and inflammation

• Environmental exposures

For some patients, mycotoxin exposure may be one additional piece of that puzzle. Not necessarily the entire puzzle, but perhaps one of the pieces that makes the rest of the picture harder to see.

How Could Mycotoxins Contribute to Migraine?

1. Oxidative Stress

One of the most consistent effects seen with mycotoxins such as ochratoxin A, aflatoxin B1, trichothecenes, and zearalenone is an increase in oxidative stress.

Oxidative stress occurs when the production of reactive oxygen species exceeds the body’s antioxidant capacity. Put simply, the body is generating more cellular “sparks” than its cleanup crew can comfortably handle.

This can damage cell membranes, proteins, DNA, and mitochondria. It can also affect neuronal signaling.

Importantly, oxidative stress has been proposed as a common pathway through which many different migraine triggers may act. A review by Borkum proposed that diverse migraine triggers may converge on oxidative stress in the brain, potentially activating pathways involved in neurogenic inflammation and headache generation.

Ochratoxin A has also been shown experimentally to increase reactive oxygen species, lipid peroxidation, mitochondrial dysfunction, and neuronal injury.

A possible sequence might look like this:

Mycotoxin exposure
↓
Oxidative stress
↓
Increased nervous-system sensitivity
↓
Lower migraine threshold

2. Mitochondrial Dysfunction

Mitochondria are the energy-producing structures inside our cells, and brain cells are especially dependent on them.

You can think of mitochondria as the cell’s tiny power plants. When they are working well, the lights stay on. When they are struggling, the brain may become a little less patient about noise, light, hormones, skipped meals, stress, or life in general.

Mitochondrial dysfunction has long been associated with migraine susceptibility.

Several mycotoxins have been shown to interfere with mitochondrial function:

• Ochratoxin A can reduce mitochondrial membrane potential and contribute to oxidative neuronal injury.

• Trichothecenes such as T-2 toxin can interfere with mitochondrial respiration and energy metabolism.

• Aflatoxin B1 has also been associated with mitochondrial dysfunction and oxidative stress in neurologic tissue.

For someone whose brain already has a lower threshold for migraine, additional mitochondrial stress could theoretically make attacks easier to trigger.

3. Neuroinflammation and Microglial Activation

The brain contains immune cells called microglia.

When activated appropriately, microglia help protect the nervous system. When they remain activated for too long, however, they can release inflammatory mediators that promote neuroinflammation.

Think of microglia as the brain’s security team. We want them alert and responsive. We do not necessarily want them treating every minor inconvenience like a five-alarm emergency.

Experimental studies have shown that ochratoxin A can activate microglia and increase inflammatory mediators such as:

• IL-1β

• IL-6

• TNF-α

• Nitric oxide

Ochratoxin A has also been shown to activate signaling pathways such as ERK and p38 MAPK.

This is relevant because neuroinflammation and glial signaling are increasingly recognized as important parts of migraine biology.

Other mycotoxins, including aflatoxin B1, T-2 toxin, deoxynivalenol, and zearalenone, have also been studied for effects on astrocytes, microglia, and inflammatory signaling.

A possible pathway could be:

Mycotoxin exposure
↓
Microglial activation
↓
Neuroinflammation
↓
Increased migraine susceptibility

4. Blood-Brain Barrier Effects

The blood-brain barrier is designed to tightly control what enters brain tissue from the circulation.

It is meant to be selective. Think of it as the brain’s very serious bouncer: “Name on the list? Purpose of visit? Any suspicious inflammatory behavior?”

Experimental evidence suggests that some mycotoxins can affect blood-brain barrier integrity and central nervous system function.

Aflatoxin B1 and trichothecenes such as T-2 toxin have been studied for their ability to disrupt barrier function and contribute to oxidative and inflammatory injury within the nervous system.

This does not mean that typical environmental exposure automatically leads to brain injury. But it does provide another possible mechanism by which certain exposures could influence neurologic symptoms in susceptible individuals.

5. Changes in Neuronal Signaling

Mycotoxins may also alter neurotransmitter systems and neuronal signaling.

Ochratoxin A has been associated experimentally with changes in dopamine-related pathways and neuronal injury in several brain regions. Trichothecenes have also been linked to changes in neurotransmission and neuronal function.

Because migraine involves altered neuronal excitability, any exposure that disrupts neuronal signaling could theoretically affect migraine threshold.

In short: when the nervous system is already a little jumpy, additional stressors may not receive the warmest welcome.

Why Ochratoxin A Is Especially Interesting

Of the mycotoxins commonly measured in clinical practice, ochratoxin A has one of the more substantial bodies of research examining potential neurotoxicity.

Ochratoxin A is produced primarily by certain Aspergillus and Penicillium species. Exposure can occur through food as well as through environmental sources.

Experimental research has linked ochratoxin A with:

• Oxidative stress

• Mitochondrial dysfunction

• Microglial activation

• Neuroinflammation

• Altered neuronal signaling

• Neuronal apoptosis

A 2023 review in Toxicology summarized substantial experimental evidence supporting the neurotoxic potential of ochratoxin A, although human clinical research remains much more limited.

That last point is important.

An elevated ochratoxin level does not prove that ochratoxin is causing a patient’s migraines. It simply gives us one biologically plausible reason to consider mycotoxin exposure as part of the clinical picture.

What About Other Mycotoxins?

Trichothecenes

Trichothecenes, including compounds such as T-2 toxin, have been shown experimentally to increase oxidative stress, impair mitochondrial function, and promote neuroinflammation.

Aflatoxins

Aflatoxin B1 is best known for its effects on the liver, but research also suggests potential effects on neurons, astrocytes, microglia, and the blood-brain barrier.

Zearalenone

The neurologic literature on zearalenone is smaller, but laboratory studies have shown increased reactive oxygen species, mitochondrial dysfunction, and neuronal cellular stress.

Gliotoxin

Gliotoxin has important immunologic and oxidative effects in experimental research, but there is currently much less evidence connecting gliotoxin specifically with migraine or other defined neurologic symptoms in humans.

In other words, some mycotoxins have more neurologic “evidence on file” than others.

Why Might Migraines Improve When Mycotoxin Exposure Is Addressed?

If mycotoxin exposure is contributing to oxidative stress, mitochondrial dysfunction, or neuroinflammation, then reducing that exposure could theoretically remove one factor that is lowering the migraine threshold.

That might look something like this:

Ongoing exposure
↓
Oxidative stress
↓
Mitochondrial dysfunction
↓
Neuroinflammation
↓
Greater neuronal sensitivity
↓
More frequent or severe migraines

Then, if an important exposure is reduced:

Reduced exposure
↓
Lower physiologic stress
↓
Less oxidative and inflammatory burden
↓
Improved nervous-system resilience
↓
Potential reduction in migraine frequency or severity

This is biologically plausible, but it has not yet been proven in controlled migraine treatment trials.

For that reason, I prefer to think of mold or mycotoxin exposure as a possible migraine amplifier, rather than automatically labeling it as the sole cause.

Sometimes it may be the volume knob, not the entire stereo system.

What I See in My Practice

In my own clinical practice, I see a relatively high number of patients with both migraine and evidence of significant mold or mycotoxin exposure.

I have also seen patients whose migraines improve as we address the broader picture: environmental exposure, oxidative stress, inflammation, gut health, sleep, nutrition, and nervous-system resilience.

This remains a clinical observation. It should not be confused with proof that lowering a urinary mycotoxin number directly causes headache improvement.

My goal is never simply to make a laboratory value decrease. We do not treat people in order to win at laboratory spreadsheets (although my patients can attest to the fact that I do love spreadsheets!)

The more important goals are to:

• Identify and reduce meaningful ongoing exposure

• Support normal elimination pathways when appropriate

• Reduce oxidative and inflammatory stress

• Support mitochondrial function

• Treat other contributors to migraine

• Continue standard migraine treatment when needed

These approaches can coexist.

A patient may need conventional migraine therapy while we simultaneously address hormonal, environmental, nutritional, metabolic, or inflammatory factors that could be lowering the migraine threshold.

There is no prize for choosing only one lane when a thoughtful, integrated approach is more likely to help.

The Bottom Line

The relationship between mycotoxins and migraine is an emerging area of research.

What we know so far is that:

• Damp and mold-affected environments have been associated with headache symptoms in human observational studies.

• Several mycotoxins can produce oxidative stress, mitochondrial dysfunction, neuroinflammation, and changes in neuronal signaling in experimental research.

• These same pathways are important in migraine biology.

Together, these findings create a biologically plausible explanation for why mold or mycotoxin exposure could lower the migraine threshold in some people.

In my clinical experience, some patients with migraine and significant mycotoxin exposure improve when the environmental exposure and associated physiologic effects are addressed.

What we do not yet know—and what conventional medicine would very reasonably insist we ask—is whether treating mycotoxin exposure reliably improves migraine across larger populations, which patients are most likely to benefit, or whether a decrease in measured urinary mycotoxin levels predicts clinical improvement.

Those are important questions, and they deserve much more research.

For the time being, I will continue to pay attention to my “overlap” patients. They have taught me that migraine often has more than one trigger, more than one pathway, and occasionally more plot twists than anyone asked for.

Selected References

Borkum JM. Migraine Triggers and Oxidative Stress: A Narrative Review and Synthesis. Headache. 2016. PMID: 26639834.

Obafemi BA, Adedara IA, Rocha JBT. Neurotoxicity of ochratoxin A: Molecular mechanisms and neurotherapeutic strategies. Toxicology. 2023. PMID: 37709162.

Chansawhang A, et al. Corticosterone potentiates ochratoxin A-induced microglial activation. 2022. PMID: 35437979.

Cytotoxic Effects of Ochratoxin A in Neuro-2a Cells: Role of Oxidative Stress Evidenced by N-acetylcysteine. PMID: 27531992.

Doi K, Uetsuka K. Mechanisms of mycotoxin-induced neurotoxicity through oxidative stress-associated pathways. International Journal of Molecular Sciences. 2011. PMID: 21954354.

Food-Origin Mycotoxin-Induced Neurotoxicity: Intend to Break the Rules of Neuroglia Cells. 2021. PMID: 34621467.

Neurotoxic mechanisms of mycotoxins: Focus on aflatoxin B1 and T-2 toxin. 2024. PMID: 38866317.

Zearalenone induced toxicity in SH-SY5Y cells: The role of oxidative stress evidenced by N-acetyl cysteine. PMID: 24412706.

The home environment in a nationwide sample of multi-family buildings in Sweden: associations with ocular, nasal, throat and dermal symptoms, headache, and fatigue among adults. PMID: 33682978.

Changes in respiratory and non-respiratory symptoms in occupants of a large office building over a period of moisture damage remediation attempts. PMID: 29324816.