What Is CIRS — And Why Your Home May Be the Cause

When symptoms don’t make sense

Chronic Inflammatory Response Syndrome (CIRS) is an under-recognized condition that often presents with a wide range of persistent, unexplained symptoms. Individuals may experience fatigue that doesn’t improve with rest, cognitive difficulties, headaches, joint pain, or sensitivity to light and sound. These symptoms often overlap with multiple diagnoses, yet standard medical evaluations frequently fail to identify a clear cause.

In many cases, the missing link is environmental. CIRS is not simply a medical issue — it is often a response to ongoing exposure within the built environment, particularly in water-damaged buildings.

Understanding CIRS

CIRS, or Chronic Inflammatory Response Syndrome, was first characterized by Dr. Ritchie Shoemaker in the context of biotoxin exposure. Unlike infections or allergies, CIRS is driven by the body’s inability to effectively clear certain toxins produced by microorganisms.

In individuals with specific genetic susceptibility (commonly associated with HLA-DR variations), biotoxins are not properly recognized and eliminated. Instead, they remain in circulation, triggering a persistent and dysregulated inflammatory response. Over time, this can affect multiple systems simultaneously, including neurological, hormonal, and immune function.

This helps explain why patients often present with symptoms that seem unrelated, yet occur together and persist despite treatment.

The role of the indoor environment

While biotoxins can originate from several sources, the most common trigger in everyday life is exposure to water-damaged buildings.

When moisture is introduced into building materials — whether through leaks, condensation, or humidity — it creates an environment where mold, bacteria, and other microorganisms can grow. These organisms release byproducts, including mycotoxins and microbial fragments, which can become airborne and inhaled.

Importantly, this exposure is often not obvious. Homes may appear clean and well-maintained while harboring hidden contamination within wall cavities, HVAC systems, or subfloor assemblies.

In Utah, this disconnect is particularly common. Despite the region’s dry climate, homes along the Wasatch Front — including areas such as Salt Lake City and surrounding communities — frequently experience moisture-related issues due to seasonal temperature shifts, basement construction, and building design factors. As a result, individuals may be continuously exposed without realizing their environment is contributing to their symptoms.

Why CIRS is frequently overlooked

One of the primary challenges with CIRS is that it does not fit neatly within traditional medical frameworks.

Symptoms often resemble other conditions such as chronic fatigue syndrome, fibromyalgia, or anxiety disorders. Without specific screening, patients may receive multiple diagnoses without addressing the underlying cause. At the same time, standard laboratory testing rarely includes the biomarkers associated with biotoxin-related illness.

Another complicating factor is exposure pattern. Many individuals feel some relief when away from their home — during travel or time spent outdoors — only to have symptoms return upon re-entry. Without a clear understanding of environmental triggers, this pattern is often attributed to stress or coincidence rather than exposure.

Compounding this further is the fact that mold growth is frequently hidden. Visual inspections alone are insufficient to rule out contamination, particularly in areas such as wall cavities, attics, and HVAC systems.

How exposure leads to illness

In susceptible individuals, biotoxin exposure initiates a cascade of events that the body is unable to fully resolve.

Toxins enter through inhalation, ingestion, or contact and are not properly tagged for removal. Instead, they bind to receptors throughout the body, activating inflammatory pathways that become self-sustaining. Over time, this chronic inflammatory state disrupts normal physiological regulation, affecting cognition, sleep, hormones, and immune response.

Because this process impacts multiple systems at once, patients often struggle to find answers within a healthcare model that treats symptoms in isolation.

Why this matters in Utah homes

Utah homes present a unique set of conditions that can contribute to hidden moisture and microbial growth.

Seasonal freeze-thaw cycles can stress building envelopes, allowing moisture intrusion. Basements are common and often prone to subtle water migration. Evaporative cooling systems introduce moisture into indoor air, and older construction may lack adequate vapor control.

These factors create environments where contamination can develop out of sight, even in homes that appear dry and well-maintained. For individuals experiencing persistent, unexplained symptoms, the indoor environment is an important and often overlooked variable.

What a proper environmental assessment looks like

Evaluating a home for potential biotoxin exposure requires more than a basic mold test. A comprehensive assessment approaches the building as a system and focuses on identifying both contamination and the conditions supporting it.

This typically includes detailed moisture evaluation using meters and thermal imaging, inspection of HVAC systems as potential reservoirs and distribution pathways, and targeted environmental sampling when appropriate. Methods such as ERMI or HERTSMI-2 testing can provide insight into mold species present within settled dust, while air sampling helps characterize what is actively circulating.

Equally important is identifying the source of moisture. Without addressing the underlying cause — whether related to leaks, ventilation, or building design — contamination will persist or recur.

Where to begin

For individuals who suspect CIRS, both medical and environmental evaluation are necessary.

On the medical side, working with a provider familiar with biotoxin illness is critical. On the environmental side, assessing the spaces where time is spent most — particularly the home — is often the most actionable first step.

The key principle is straightforward: ongoing exposure must be removed for recovery to occur. Environmental conditions are not secondary to the illness — they are often central to it.

Final perspective

CIRS challenges the assumption that chronic illness is always rooted solely within the body. In many cases, the environment plays a direct and measurable role.

When symptoms are persistent, unexplained, and resistant to treatment, it is worth considering whether the space you live in may be contributing. Identifying and addressing environmental factors does not replace medical care — it completes the picture.

Your home should support your health, not undermine it.

About the Author

Written by Devon Kennedy, Certified Indoor Environmentalist through the American Council for Accredited Certification (ACAC) and founder of Utah Mold Pros. His work focuses on moisture-driven investigations, HVAC-related contamination, and CIRS-informed environmental assessments across Utah.