CIRS: Symptoms, Screening, and How Clinicians Approach It

What is CIRS and who gets it?

Chronic Inflammatory Response Syndrome (CIRS) is a condition where the immune system gets stuck in a state of constant inflammation after exposure to biotoxins from water damaged buildings. The condition was defined and named by the clinicians who built the CIRS framework. Worth knowing up front: the CDC and other mainstream bodies do not recognize CIRS as a standard diagnosis, so you will see strong opinions in both directions. What follows is the framework as its authors describe it.

The framework holds that a minority of people carry HLA-DR genetic variants that keep their immune system from recognizing and clearing mold biotoxins. In these susceptible people, the theory goes, the toxins recirculate instead of being tagged, processed, and eliminated. This genetic theory comes from the framework’s own research and has not been validated by independent mainstream studies. The result is chronic, multi system inflammation that can persist for years, even after leaving the moldy environment.

Most people who get sick from mold exposure recover once the exposure stops. In the framework’s model, the genetically susceptible do not: the inflammation continues even after they leave. Whatever the mechanism turns out to be, the pattern it tries to explain is real and familiar: some family members get very sick in a moldy house while others seem fine.

CIRS symptoms: the 13 clusters

The framework’s researchers grouped the symptoms into 13 clusters. Per their published work, scoring positive in 8 or more clusters combined with a failed VCS screen is the threshold they treat as strongly suggestive of CIRS. Use it as a structured way to describe what you are experiencing to a doctor. The clusters are:

1. Fatigue: Persistent exhaustion that does not improve with sleep or rest.
2. Weakness: Muscle weakness, reduced exercise tolerance, trouble climbing stairs.
3. Body aches: Joint pain, morning stiffness, muscle cramps, sharp "ice pick" pains.
4. Headaches: Frequent headaches, especially in the morning or when entering certain buildings.
5. Light sensitivity: Eyes hurt in bright light, difficulty driving at night, tearing eyes.
6. Memory and focus: Brain fog, word finding difficulty, poor concentration, confusion.
7. Skin sensitivity: Unusual tingling, numbness, or electrical sensations. Static electricity shocks (a pattern CIRS practitioners report as distinctive).
8. Shortness of breath: Chronic cough, difficulty taking a full breath, sinus congestion.
9. Sinus problems: Chronic congestion, recurring sinus infections, post nasal drip.
10. Appetite and GI: Nausea, diarrhea, abdominal pain, new food sensitivities.
11. Temperature regulation: Night sweats, feeling too hot or too cold, alternating between both.
12. Urinary changes: Frequent urination, excessive thirst.
13. Mood: Anxiety, depression, irritability, mood swings without clear cause.

The most diagnostic single pattern is feeling better away from home and worse at home. Every single expert in our research says this is the gold standard signal for environmental mold exposure.

The VCS test: free screening you can do right now

The Visual Contrast Sensitivity (VCS) test measures your ability to distinguish between shades of gray at different spatial frequencies. Practitioners in this field report that biotoxin exposure reduces contrast sensitivity in a recognizable pattern, which is why they use this screen.

Take the free test at vcstest.com. It takes about 10 minutes. You will look at a series of images and identify which direction lines are tilted. A passing result means your contrast sensitivity is normal. A failed screen is a flag worth bringing to a clinician, not a diagnosis. The accuracy figures quoted for the test come from the framework’s own research, so treat them as the authors’ numbers rather than independently confirmed ones.

Important: practitioners note that a passing VCS screen does not rule out CIRS, and a failing screen in someone with multi-system symptoms is their signal to evaluate further. Either way, the screen is a conversation starter with a physician, not an answer.

How clinicians approach CIRS (and why the home comes first)

Every practitioner in this field agrees on the first move, and it is not a pill: get the exposure to stop. That means finding the moisture problem, fixing it, and remediating the mold, or leaving the building if that is not possible. No medical plan works while you are still breathing the trigger.

Step one happens at home. Test so you have data: an ERMI or HERTSMI-2 dust test gives you a number. On the HERTSMI-2 band scale, below 11 reads safe, 11 to 15 is borderline, and above 15 is a do-not-occupy signal (those bands apply to HERTSMI-2 only). Pair the lab data with a room-by-room visual check: our free checklist and the Mold Scanner AI app walk you through the 160 spots inspectors look at. If remediation is needed, hire a qualified mold remediation professional (one who follows the IICRC S520 standard; ACAC or RIA credentials and state licenses count too).

Step two happens at a doctor's office, not on a webpage. Physicians who work with CIRS run lab panels (inflammatory and regulatory markers such as C4a, TGF-beta-1, and MSH), use screens like the VCS test, and manage a sequenced plan that can include prescription medication. The specifics (which medications, what order, what dose) depend on your labs and history. We deliberately do not publish the medication steps here, because following a drug protocol without a physician is how people get hurt.

Finding the right doctor matters more than memorizing any protocol. Most primary care physicians have little training in environmental illness, and mainstream bodies like the CDC do not recognize CIRS as a standard diagnosis, so expect mixed reactions. Clinicians who evaluate it tend to be in environmental medicine: the ISEAI directory at iseai.org/find-a-professional is the usual starting point. Bring your symptom-cluster notes, your VCS result, and your home test data. That combination gives a doctor something concrete to work with.