The Root Causes of Eczema and Integrative Ways to Actually Manage It
If you've had eczema for any length of time, you know the cycle. It flares. You use the topical steroid. It clears. A few weeks later, it flares again. Over time the flares get more frequent, or the steroids stop working as well, or new patches appear somewhere they hadn't before. And when you ask your dermatologist why it keeps coming back, you're often told it's chronic — something to manage, not something to solve.
That's not entirely wrong. But it is incomplete in a way that keeps a lot of women stuck in a loop for years.
Eczema is a skin condition with its roots almost always somewhere else entirely. In the gut. In the immune system. In the liver. In the stress response. In the environment you're living and working in. Treating only the surface without finding those deeper drivers is how the flare-treat-clear-flare cycle persists. When you actually find what's driving it, the pattern can change — not just be suppressed.
Here's how I approach it.
The Gut-Skin Axis: Where Most Eczema Cases Start
The gut-skin axis is one of the most well-researched connections in integrative medicine, and it's where I start with almost every eczema case that walks into my practice.
Your gut microbiome communicates directly with your immune system — roughly 70 percent of your immune activity lives in and around the gut lining. When the microbiome is dysbiotic, meaning the composition is off, the immune system becomes dysregulated in characteristic ways. In atopic dermatitis specifically, this tends to manifest as overactivation of the Th2 immune pathway — the branch of your immune response associated with allergic and inflammatory reactions. When the Th2 pathway is chronically dominant, the result is the skin inflammation, reactivity, and barrier breakdown we recognize as eczema.
Research consistently shows differences in the gut microbiome of people with eczema compared to those without it: lower levels of Lactobacillus and Bifidobacterium species, reduced microbial diversity, and alterations that often begin in early infancy and persist into adulthood. This is also why eczema so often travels with other atopic conditions — asthma, hay fever, food allergies. It's the same underlying immune dysregulation expressing itself in different tissues.
The first thing I order when someone comes to me with chronic eczema is a GI-MAP stool test. It maps the full microbiome composition, identifies dysbiosis, looks for opportunistic and pathogenic bacteria, checks for parasites and H. pylori, and measures markers of intestinal inflammation (calprotectin, secretory IgA) and gut barrier function (zonulin). What's in the gut almost always tells you something meaningful about what's on the skin.
Intestinal Permeability (Leaky Gut)
Closely related to dysbiosis is intestinal permeability — leaky gut. The lining of your small intestine is a selective barrier: it's designed to allow nutrients through into the bloodstream while keeping bacteria, endotoxins, and undigested food particles out. When the tight junctions of that lining are compromised, those particles breach the barrier, enter circulation, and trigger an immune response.
That immune response needs somewhere to express itself. In people with an atopic tendency — a genetic and epigenetic predisposition toward allergic and inflammatory reactivity — the skin is one of the most common targets. Chronic eczema that doesn't respond fully to topical treatment, or that keeps returning regardless of what you put on it, is often pointing to intestinal permeability as part of the picture.
Leaky gut and dysbiosis almost always co-occur. Addressing one without the other is why gut-focused protocols sometimes improve symptoms without resolving them fully.
Food Sensitivities and Delayed Reactivity
Food sensitivities are among the most common and most frequently unidentified triggers for eczema — and they're distinct from food allergies. A true IgE-mediated allergy causes an immediate, often dramatic reaction: hives, throat tightening, a clear cause-and-effect. A food sensitivity is a delayed, low-grade immune response (typically IgG-mediated) that produces inflammation hours or even a day or two after exposure. Because the reaction is delayed and often diffuse, the connection to a specific food is easy to miss entirely.
The most common offenders I see in the context of eczema are gluten, dairy, eggs, soy, corn, and tree nuts. But sensitivities are individual, and the only way to identify yours with confidence is through a structured elimination protocol: removing the likely suspects for four to six weeks and then reintroducing them systematically to observe the response. IgG food sensitivity testing can help guide that process and prioritize where to start, though the elimination and reintroduction phase is ultimately the most clinically definitive method.
Skin Barrier Dysfunction
At the skin itself, many people with eczema have structurally compromised barrier function. This is often related to variants in the filaggrin gene — filaggrin is a protein that's essential for building and maintaining the outermost protective layer of skin. When filaggrin function is reduced, the skin loses moisture more easily, becomes more permeable to environmental allergens and irritants, and is more reactive across the board. This is why eczema-prone skin tends to be dry, itchy, and reactive even in the absence of an obvious trigger.
Supporting the skin barrier topically is a core component of integrative management: ceramide-rich, fragrance-free moisturizers applied immediately after bathing (the "soak and seal" method), avoiding surfactant-heavy soaps, and using products free of synthetic fragrances, dyes, and preservatives like methylisothiazolinone. Herbal topical preparations — calendula, colloidal oatmeal, chamomile — can support barrier repair and reduce inflammation with fewer systemic effects than corticosteroids, making them better suited to longer-term use.
Mold, Mycotoxins, and Environmental Triggers
This is one of the most underestimated root causes of treatment-resistant eczema. Mold exposure and mycotoxin accumulation — mycotoxins are toxic compounds produced by mold — can drive significant immune dysregulation, and for some people they're the primary driver of eczema that won't respond to anything else.
If your eczema has been largely treatment-resistant, if you've lived or worked in a building with known or suspected water damage, or if your symptoms cluster with other signs of mold exposure — persistent fatigue, brain fog, sinus congestion, chemical sensitivity — mold belongs in your differential. Urine mycotoxin testing through a functional medicine lab can identify exposure. The critical point here is that remediating the environment, not just treating the individual, is the necessary step if mold is confirmed. You cannot supplement your way out of ongoing mold exposure.
Other environmental triggers worth assessing: synthetic fabric dyes and finishings in clothing, detergent residue, chlorinated tap water in areas with high chloramine content, and air quality in both home and work environments.
Heavy Metal Accumulation
Heavy metals — mercury, arsenic, nickel, cadmium, lead — can contribute to immune dysregulation and chronic skin inflammation. Mercury specifically has been associated with atopic conditions in the research literature, with sources including amalgam fillings, high fish consumption (particularly large, long-lived fish like tuna and swordfish), and occupational exposure. Nickel sensitivity is one of the most well-documented drivers of contact eczema and is particularly common in women who react to jewelry, belt buckles, and certain foods high in nickel content.
Heavy metal testing through a functional medicine lab — urine provocation testing or blood depending on the suspected exposure — can identify accumulation that standard care never looks for and rarely considers.
Liver Detoxification
Your liver handles the clearance of inflammatory compounds, environmental chemicals, excess hormones, and the end products of immune activity. When liver detox pathways are sluggish — particularly the phase II conjugation pathways that neutralize these compounds for excretion — the inflammatory burden backs up systemically, and the skin often becomes an alternative exit route.
This is especially relevant for women whose eczema worsens around hormonal shifts: the week before their period, on hormonal birth control, during perimenopause. Estrogen metabolism runs through the liver, and when clearance is impaired, estrogen and its metabolites recirculate and add to the systemic inflammatory load. Supporting liver function — through cruciferous vegetables, adequate B vitamins (especially B6, B9, B12), NAC, and a reduction in alcohol and environmental chemical exposure — is part of almost every chronic eczema protocol I build.
Stress and the HPA Axis
The relationship between stress and eczema is not anecdote. Psychological and physiological stress activates the HPA axis, raises cortisol, and directly modulates immune function in ways that trigger and perpetuate inflammatory skin conditions. Stress also increases skin permeability, reduces barrier function, and amplifies the itch response — and the itch-scratch cycle itself generates a stress response that feeds the loop from the other direction.
I want to be clear that this is not the same as saying eczema is caused by stress or is psychosomatic. It's saying that the nervous system is a meaningful physiological driver of immune regulation, and chronic sympathetic activation impairs the body's ability to resolve inflammation. Including nervous system regulation in an eczema protocol isn't a soft suggestion — it's addressing a real biological variable.
What an Integrative Eczema Protocol Actually Looks Like
Test before treating. A GI-MAP for microbiome and gut health markers. An IgG food sensitivity panel. A full thyroid panel if symptoms fluctuate cyclically. Heavy metal testing when there's clinical reason. Environmental assessment for mold if symptoms are treatment-resistant or cluster with other mold exposure signs.
Heal the gut. Address dysbiosis with targeted probiotics — strains like Lactobacillus rhamnosus GG, Lactobacillus plantarum, and Bifidobacterium infantis have the most evidence in atopic conditions. Restore intestinal barrier integrity with gut-healing nutrients. Rebuild microbial diversity with prebiotic-rich whole foods.
Identify and remove food triggers. An elimination and reintroduction protocol is the most reliable tool. IgG testing can guide the starting point.
Support the skin barrier. Ceramide-rich, fragrance-free moisturizers. Lukewarm (not hot) baths or showers. Pat dry rather than rubbing. Minimal, simple topical products. Herbal preparations for barrier repair between flares.
Support liver detox. Cruciferous vegetables daily, adequate B vitamins, NAC, glutathione support, and honest assessment of environmental chemical load.
Take the nervous system seriously. Whatever form regulation takes for you — somatic practice, breathwork, therapy, sleep optimization, appropriate adaptogenic support — this is not optional. Eczema is a condition that lives at the intersection of immune, gut, and stress biology. A protocol that doesn't include nervous system support is leaving one of its most consistent drivers untouched.
Eczema is not just a skin condition. It's the skin telling you something is happening somewhere deeper. And when you find the actual drivers — the dysbiosis, the food sensitivity, the environmental exposure, the immune dysregulation, the liver bottleneck — you can start to shift the pattern, not just suppress what's visible on the surface.
Frequently Asked Questions
What are the root causes of eczema? The most common root causes of eczema include gut dysbiosis and intestinal permeability (leaky gut), food sensitivities (particularly to gluten, dairy, and eggs), skin barrier dysfunction related to filaggrin variants, environmental triggers like mold and mycotoxins, heavy metal accumulation, impaired liver detoxification, and chronic stress and HPA axis dysregulation. Often more than one is present simultaneously.
Is eczema related to gut health? Yes, strongly. The gut-skin axis is well-established in the research: gut dysbiosis drives immune dysregulation that directly affects the skin. People with eczema consistently show lower levels of beneficial bacteria like Lactobacillus and Bifidobacterium, and higher markers of intestinal permeability. Healing the gut is one of the most impactful parts of an integrative eczema protocol.
Can food sensitivities cause eczema? Yes. Food sensitivities — distinct from true allergies in that they involve a delayed, IgG-mediated immune response rather than an immediate IgE reaction — are among the most common and most missed triggers for eczema. The most frequent offenders are gluten, dairy, eggs, soy, and tree nuts, though sensitivities are individual. An elimination and reintroduction protocol is the most reliable way to identify your specific triggers.
What tests are helpful for eczema? A GI-MAP stool test, IgG food sensitivity panel, thyroid panel (TSH, free T3, free T4, antibodies), and heavy metal testing are useful depending on the clinical picture. For treatment-resistant eczema, urine mycotoxin testing should be considered, especially with any history of potential mold exposure.
Can stress cause eczema flares? Yes. Chronic stress activates the HPA axis and directly modulates immune function in ways that trigger inflammatory skin reactions. Stress also increases skin permeability and amplifies the itch response, creating a self-reinforcing cycle. Nervous system regulation is a meaningful clinical component of eczema management.
What foods should I avoid with eczema? The most common dietary triggers are gluten, dairy, eggs, soy, corn, and tree nuts — though food triggers are highly individual. An elimination diet followed by structured reintroduction is the most reliable method. In general, a whole-food, anti-inflammatory diet low in processed foods, refined carbohydrates, and alcohol tends to reduce the inflammatory background that eczema thrives in.
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Medical Disclaimer: The information provided on this page is for educational and informational purposes only. It is not intended to diagnose, treat, cure, or prevent any disease or health condition, and it does not constitute medical advice. This content is not a substitute for professional medical guidance, diagnosis, or treatment. Always consult with a qualified, licensed healthcare provider before beginning any new supplement protocol, making dietary changes, or modifying your current health plan.