Many people assume mold is only a problem in humid climates. But in our practice in Fort Collins, we regularly evaluate patients whose chronic, unexplained symptoms trace back to mold exposure — right here in Colorado. Water leaks, plumbing failures, HVAC systems, basements, crawl spaces, and previous flood or water damage can all create indoor conditions where mold takes hold, regardless of how dry it is outside. In many cases, the mold is hidden — behind walls, under flooring, or inside ventilation systems — and patients have no idea it’s there.
What makes mold illness so difficult to identify is that it rarely looks like what most people expect. It doesn’t always start with respiratory symptoms or a rash. For many patients, it shows up as fatigue that doesn’t respond to rest, cognitive difficulties that come and go, digestive problems with no clear cause, or a gradual sense that their body is reacting to everything. By the time they come to us, many have already been told their labs are normal and their symptoms are stress-related.
Mold toxicity treatment at Rocky Mountain Natural Medicine begins with understanding what is actually driving your symptoms — not just managing them.
Could Mold Toxicity Be Behind Your Symptoms?
Not everyone exposed to mold becomes ill. Genetics play a significant role: approximately one in four people carry gene variants that impair the body’s ability to recognize and clear mycotoxins — the toxic compounds produced by mold. For these individuals, mycotoxins don’t get efficiently eliminated. They recirculate, accumulate, and drive a self-perpetuating inflammatory response that can affect nearly every system in the body.
This is why two people can live in the same building and have completely different outcomes. It’s also why standard testing so often misses it — conventional labs aren’t designed to capture this kind of immune dysregulation.
Symptoms of mold illness vary from patient to patient, but commonly include:
- Persistent fatigue that doesn’t improve with rest
- Brain fog, memory problems, and difficulty concentrating
- Frequent headaches or migraines
- Chronic sinus congestion, postnasal drip, or cough
- Dizziness or lightheadedness, especially when standing
- Anxiety, depression, irritability, or mood instability
- Sleep problems and non-restorative sleep
- Joint pain, muscle aches, or morning stiffness
- Digestive symptoms: bloating, nausea, altered bowel habits
- Increased sensitivity to foods, chemicals, or fragrances
- Skin rashes or unexplained inflammation
- Hormonal disruption
- Frequent infections or a sense that your immune system is off
These symptoms overlap with many other diagnoses — fibromyalgia, chronic fatigue syndrome, anxiety, IBS, and autoimmune conditions among them. This is exactly why mold illness goes unidentified for so long. If you’ve been evaluated repeatedly without a clear answer, environmental exposure is worth investigating.
Mold Illness and Related Conditions: POTS, MCAS, Leaky Gut, and Histamine Intolerance
One of the most important things to understand about mold toxicity is that it rarely occurs in isolation. In clinical practice, we frequently see mold illness as the underlying driver — or a significant contributor — to several overlapping conditions that are otherwise difficult to explain.
Postural Orthostatic Tachycardia Syndrome (POTS)
Patients with mold illness often experience significant symptoms when they stand — racing heart, lightheadedness, fatigue, and brain fog that worsen with positional changes. Mycotoxins can disrupt autonomic nervous system regulation and interfere with hormonal signals that control blood volume and vascular tone. For patients with a POTS diagnosis whose symptoms haven’t responded well to conventional management, underlying biotoxin exposure is frequently worth evaluating.
Mast Cell Activation Syndrome (MCAS)
Mycotoxins are potent activators of mast cells — the immune cells responsible for triggering allergic and inflammatory reactions. When mast cells are chronically overstimulated by mycotoxin burden, the result is a pattern of reactivity that doesn’t fit standard allergy testing: flushing, hives, gastrointestinal distress, anaphylactoid reactions, and sensitivity to foods, smells, and medications that previously caused no problems. MCAS and mold illness share overlapping mechanisms and often require parallel treatment.
Gut Microbiome Disruption and Intestinal Permeability
Mycotoxins directly damage the intestinal lining, compromising the tight junctions that keep the gut barrier intact. They also alter the composition of the gut microbiome, suppressing beneficial bacterial populations and promoting dysbiosis. The result is a bidirectional cycle: gut damage impairs mycotoxin clearance, while ongoing mycotoxin exposure perpetuates gut dysfunction. This is why patients with mold illness so often present with digestive symptoms and food sensitivities that don’t resolve with dietary changes alone.
Histamine Intolerance
Many patients with mold illness develop a pattern of reactivity to high-histamine foods — fermented foods, aged cheeses, alcohol, leftovers — that can look like food sensitivity but is actually downstream of the mold exposure itself. Mast cell activation drives histamine release, while gut dysbiosis increases histamine-producing bacteria and impairs the enzyme responsible for breaking histamine down. Addressing the root cause — the mycotoxin burden — is essential for resolving histamine intolerance long term.
How We Evaluate Mold Toxicity
Standard lab work is generally insufficient to identify mold illness. A comprehensive evaluation may include:
- Detailed environmental and occupational exposure history (Mold illness symptoms can persist, even after the exposure has stopped)
- Comprehensive symptom review using validated CIRS (Chronic Inflammatory Response Syndrome) criteria
- Mycotoxin urine testing
- HLA-DR genetic susceptibility testing
- Innate immune markers and inflammatory indices
- Visual Contrast Sensitivity (VCS) screening
- Gut microbiome and organic acids testing when indicated
- Thyroid, hormone, and adrenal assessment
Testing is selected based on your individual history and clinical presentation. The goal is not to run every available test, but to build a clear picture of what is driving your symptoms and how to address it most effectively.
Mold Toxicity Treatment at Rocky Mountain Natural Medicine
Mold toxicity treatment is not a one-size-fits-all protocol. The right approach depends on your specific mycotoxin burden, genetic susceptibility, symptom profile, and any co-occurring conditions. Treatment plans are individualized and adjusted as your health improves. Depending on your situation, support may include:
- Identifying and addressing ongoing environmental exposures, including past exposures
- Supporting the body’s natural detoxification pathways
- Reducing systemic inflammatory burden
- Optimizing gut health and restoring intestinal barrier function
- Balancing and modulating immune system function
- Improving nutritional status and correcting underlying deficiencies
- Supporting mitochondrial function and cellular energy production
- Addressing co-occurring conditions such as MCAS, POTS, or histamine intolerance
Recovery from mold illness is a process. Most patients begin to notice meaningful improvement in energy, cognitive function, and overall symptom burden within the first few months of treatment, with objective improvements in lab markers following over time. We adjust your protocol as you progress.
Who We Work With
We commonly work with patients who have been dealing with chronic, multi-system symptoms for months or years without a clear diagnosis. Many have seen multiple providers, had extensive conventional workups, and been told their results are normal. If that describes your experience — and particularly if you have any reason to suspect past or current mold exposure — a comprehensive functional medicine evaluation may provide the answers you’ve been looking for.
Dr. Sarah Kashdan at Rocky Mountain Natural Medicine has specific experience evaluating and treating mold illness and environmental exposures as part of a comprehensive, root-cause approach to complex chronic conditions.
Schedule a Complimentary Consultation
If you are in or around Fort Collins or Northern Colorado and have been struggling with unexplained symptoms that have not responded to conventional care, mold toxicity may be worth investigating. We offer complimentary 15-minute consultations to discuss your history, our approach to mold toxicity treatment, and whether naturopathic functional medicine care is a good fit for your situation.