In last month’s blog, we explored mould exposure and its potential impact on health. For many people, discovering mould in their home or workplace is the first step towards understanding why they have been struggling with chronic symptoms for months or even years. But mould itself is only part of the story.
One of the most important reasons mould can affect health so profoundly is because of substances known as mycotoxins.
If you are living with an autoimmune disease, wondering whether you may have one, or searching for answers about why your symptoms continue to flare despite your best efforts, understanding mycotoxins may provide another piece of the puzzle.
What Are Mycotoxins?
Mycotoxins are toxic compounds produced by certain species of mould. Think of them as biological chemicals that mould creates as a survival mechanism. While not every mould produces mycotoxins and not every mould exposure results in illness, some mycotoxins can have significant effects on human health.
Unlike visible mould, mycotoxins are microscopic. You cannot see them, smell them, or easily identify their presence without specialised testing. This means some people may continue to experience symptoms even after visible mould has been removed because the toxic compounds can linger in the environment and continue to affect the body.
Why Does This Matter for Autoimmune Disease?
If you have read much about autoimmune disease, you have likely heard that genetics play a role. This is certainly true, but genetics rarely tell the whole story.
Many people carry genes associated with autoimmune disease and never develop symptoms. Others develop autoimmune conditions despite having no significant family history. This raises an important question: what activates the immune system in a way that contributes to autoimmune disease?
Functional medicine seeks to answer that question by looking beyond a diagnosis and investigating the factors that may be driving inflammation and immune dysfunction. Chronic infections, gut health problems, stress, environmental toxins, nutritional deficiencies, hormonal imbalances, and poor sleep can all contribute. Mycotoxins fall into the category of environmental toxins and may act as an ongoing source of immune activation in susceptible individuals.
How Mycotoxins May Affect the Immune System
The immune system is designed to protect us from danger. When it encounters something harmful, it responds by creating inflammation and activating defence mechanisms. The problem occurs when those signals remain switched on for months or years.
Research suggests that mycotoxins may contribute to chronic inflammation, increase oxidative stress, impair mitochondrial function, and disrupt the body’s normal ability to regulate immune responses. For someone already dealing with an autoimmune disease, this can be particularly significant.
Imagine trying to extinguish a fire while someone continues adding small pieces of wood to the flames. The fire may never fully go out because the source of irritation remains present. In a similar way, an ongoing environmental exposure may make it more difficult for the immune system to regain balance.
When Symptoms Do Not Quite Add Up
One of the challenges with mycotoxin-related illness is that symptoms can be incredibly broad and often overlap with other conditions. Fatigue, brain fog, headaches, joint pain, digestive issues, sinus congestion, poor sleep, anxiety, and skin problems are all commonly reported.
This is one reason why mould and mycotoxins can be overlooked. Many people spend years searching for answers because their symptoms seem unrelated or because they have been attributed solely to stress, ageing, or an existing autoimmune diagnosis.
Some individuals notice that symptoms worsen when they spend time in a particular building and improve when they leave. Others experience more subtle patterns that are only uncovered after taking a careful look at their health history and environmental exposures.
The Gut Connection
One of the most fascinating aspects of mycotoxin research involves the gut. This is especially important because so much of the immune system is closely connected to digestive health.
Certain mycotoxins appear capable of disrupting the intestinal barrier, altering the balance of beneficial bacteria, and increasing inflammation within the digestive tract. From a functional medicine perspective, this matters because gut dysfunction is a common thread running through many autoimmune diseases.
When the gut barrier becomes compromised, substances that would normally remain inside the digestive tract may come into contact with the immune system. Over time, this can contribute to ongoing immune activation and make it more difficult for the body to regulate inflammation appropriately.
This does not mean that every autoimmune disease begins in the gut, but it does help explain why supporting gut health is often such an important part of a comprehensive treatment plan.
Why Some People Are More Affected Than Others
One question I hear frequently is, “If mould and mycotoxins are so common, why do some people become very ill while others seem unaffected?”
The answer is likely that no single factor determines how a person responds. Genetics may influence how efficiently the body processes toxins. Existing autoimmune disease, chronic infections, poor sleep, high stress levels, nutritional deficiencies, and overall toxic burden can all affect resilience.
I have often referred to health in terms of a bucket. Every stressor adds a little water to that bucket. Stress, infections, poor sleep, dietary challenges, environmental toxins, and unresolved inflammation all contribute. Eventually, the bucket becomes full and symptoms begin to appear.
For some people, mycotoxin exposure may be one of the factors that pushes them beyond their body’s ability to compensate.
Looking Beyond Symptom Management
One of the reasons I appreciate the functional medicine approach is that it asks different questions. Rather than focusing solely on suppressing symptoms, it seeks to understand why the immune system may be struggling in the first place.
This does not mean that mycotoxins are the cause of every autoimmune condition. Autoimmune disease is complex, and there is rarely a single trigger. However, it does mean recognising that environmental factors may be playing a role and deserve consideration as part of a broader investigation. And that is the whole premise behind the functional perspective. It’s not simply placing a bandaid on symptoms; it’s the whole endeavor of looking at all angles until a root cause is discovered and healing from the inside out can begin. For many patients, discovering and addressing previously overlooked contributors can be a significant turning point in their health journey.
Why Functional Medicine For Issues Like Mycotoxins And Autoimmunity?
When mycotoxin exposure is suspected, functional medicine aims to view the body as an interconnected system rather than a collection of isolated symptoms. Instead of looking only at the immune system, we may also explore gut health, nutrient status, detoxification pathways, sleep, stress, hormone balance, and environmental exposures.
The goal is not simply to determine whether mould is present. The goal is to understand how your body is responding and what may be preventing recovery. This allows for a more personalised plan that supports healing from multiple angles rather than relying on a single intervention.
Practical Steps You Can Take Today
If this topic resonates with you, there are several simple places to begin.
Start by paying attention to patterns. Do your symptoms seem worse in certain environments? Do you feel better when travelling or spending more time outdoors? Sometimes the clues are already present, but we have never paused to connect them.
Take a look around your home as well. Signs of previous water damage, leaks, condensation, or persistent musty odours may warrant further investigation. Remember that mould is not always visible.
Supporting your body’s resilience can also make a meaningful difference. Prioritising sleep, eating a nutrient-dense whole-food diet, spending time outdoors, and reducing unnecessary chemical exposures all help lower the overall burden on the immune system. These changes may seem simple, but they create a stronger foundation for healing.
Most importantly, do not feel that you need to navigate this process alone. Autoimmune disease is rarely straightforward, and finding the right support can make all the difference.
If you are struggling with autoimmune symptoms, chronic inflammation, unexplained fatigue, brain fog, or a condition that seems resistant to treatment, it may be worth considering whether environmental factors are part of the picture.
As we discussed in last month’s blog on mould, what we are exposed to every day can significantly influence our health. Mycotoxins represent one possible piece of that puzzle, particularly for individuals whose immune systems are already under strain.
The encouraging news is that the body possesses an incredible capacity for healing when underlying obstacles are identified and addressed. Functional medicine offers a framework for asking deeper questions, investigating potential triggers, and creating a personalised path towards better health. Please reach out to talk through your next steps!
Sources:
Omotayo, O. P., Omotayo, A. O., Mwanza, M., & Babalola, O. O. (2019). Prevalence of mycotoxins and their consequences on human health. Toxicological Research, 35(1), 1–7. https://doi.org/10.5487/TR.2019.35.1.001
Sharma RP. Immunotoxicity of mycotoxins. J Dairy Sci. 1993 Mar;76(3):892-7. doi: 10.3168/jds.S0022-0302(93)77415-9. MID: 8463496.
Liew WP, Mohd-Redzwan S. Mycotoxin: Its Impact on Gut Health and Microbiota. Front Cell Infect Microbiol. 2018 Feb 26;8:60. doi: 10.3389/fcimb.2018.00060. MID: 29535978; PMCID: PMC5834427.
Campbell AW, Thrasher JD, Gray MR, VojdaniA. Mold and mycotoxins: effects on the neurological and immune systems in humans. Adv Appl Microbiol. 2004;55:375-406. doi: 10.1016/S0065-2164(04)55015-3. PMID: 15350803.
