What Are the Symptoms of CIRS? (And Why They’re So Hard to Diagnose)
If you’re reading this, you’ve probably been sick for a long time.
Not dramatically, acutely sick but a grinding, relentless kind of sick that nobody seems to be able to explain. You’re tired in ways that sleep doesn’t fix. Your brain doesn’t work the way it used to. You hurt. You’ve been to doctor after doctor, had test after test, and come back with results that say you’re fine when you are clearly not fine.
Some of you have been given diagnoses. Unfortunately, those “diagnosis” are just descriptions of your symptoms. Words like fibromyalgia, chronic fatigue syndrome, irritable bowel syndrome, or, mast cell activation syndrome. Even anxiety or depression. Maybe all of the above. What you haven’t been given is an answer. Something that actually explains what’s happening in your body and offers a real path forward.
This post is for you.
There’s a condition called Chronic Inflammatory Response Syndrome (CIRS) that presents exactly this way. It affects nearly every system in the body simultaneously. Its symptoms are non-specific, meaning they don’t point neatly toward a single diagnosis. And because most practitioners have never heard of it, it gets missed constantly.
I’m going to walk you through the symptoms of CIRS as thoroughly as I can: what they are, how they’re organized, why they’re so confusing, and what to do next if any of this resonates.
What Is CIRS?
Before we get into the symptom list, a quick primer.
CIRS is a multi-system, multi-symptom inflammatory illness triggered by exposure to biotoxins. The most common source is found in water-damaged buildings. But Lyme disease, certain marine toxins, and other environmental exposures can also be triggers. It was identified and rigorously characterized by Dr. Ritchie Shoemaker, and it’s now supported by a substantial body of peer-reviewed research.
The underlying problem is innate immune system dysregulation. In most people, the immune system encounters a biotoxin, mounts a response, clears it, and moves on. In people with CIRS (roughly 24% of the population due to a specific HLA genetic variant) the immune system can’t complete that process. It keeps reacting to biotoxins that it can’t properly identify or remove. The result is a chronic, whole-body inflammatory state that gradually disrupts nearly every regulatory system you have.
That’s why the symptoms of CIRS are so broad. This isn’t a respiratory illness or a neurological illness or a gastrointestinal illness. It’s all of them, simultaneously, driven by the same root cause.
Why CIRS Symptoms Are So Difficult to Diagnose
Here’s the challenge with the symptoms of CIRS: they are non-specific.
Take fatigue, for example. Fatigue is associated with hundreds of different conditions: anemia, thyroid dysfunction, diabetes, cancer, sleep disorders, depression, heart disease, and on and on. If a patient walks into a clinic and says they’re exhausted, fatigue alone doesn’t tell a practitioner much. The same is true of brain fog, joint pain, headaches, and most of the other symptoms on the CIRS list.
Because of this, practitioners who are unfamiliar with CIRS tend to address each symptom in isolation: treating the GI symptoms as IBS, the mood symptoms as anxiety, the fatigue as a sleep disorder. The patient accumulates diagnoses and treatments that address the surface, but the underlying driver, biotoxin-driven immune dysregulation, continues unchecked.
This is where Dr. Shoemaker’s insight was genuinely a breakthrough. Rather than looking at individual symptoms, he looked at symptom clusters: patterns of co-occurring symptoms that, taken together, reliably point toward CIRS. Understanding this clustering approach is the key to making sense of how CIRS is identified.
The Body Systems Affected by CIRS
CIRS can show up in virtually any part of the body. Here’s a system-by-system breakdown of what that can look like.
Neurological and Cognitive
This is often where patients suffer most. And where they’re most frequently dismissed.
Brain fog, difficulty concentrating, memory problems, and challenges with word recall are among the most commonly reported CIRS symptoms. Patients may find that their thinking is slower, that they lose words mid-sentence, or that tasks they used to handle easily have become overwhelming. Mood changes, including anxiety, depression, and mood swings, are also common. This is often the reason patients get referred to mental health practitioners rather than CIRS specialists.
The neurological burden of CIRS is well-documented in the peer-reviewed literature. What looks like a psychiatric presentation is frequently a physiological one, driven by inflammatory cytokines affecting brain function.
Fatigue and Energy
Profound, unrelenting fatigue is one of the hallmarks of CIRS. This isn’t tiredness that is resolved with rest. It’s a cellular energy problem. As I wrote about in my post on long COVID and CIRS, CIRS disrupts mitochondrial function, meaning your cells are genuinely struggling to produce adequate energy. No amount of rest fixes a mitochondrial problem.
Many CIRS patients are also told they have chronic fatigue syndrome before the correct diagnosis is made. In some cases, CFS and CIRS overlap significantly. The CIRS diagnosis explains the underlying mechanism that CFS does not.
Musculoskeletal
Joint pain, muscle aches, stiffness (particularly morning stiffness) and muscle cramps are common CIRS symptoms that often lead to misdiagnosis of fibromyalgia or early arthritis. The inflammatory cascade triggered by biotoxins affects connective tissue throughout the body, causing pain that can be diffuse and hard to localize.
Respiratory
Persistent cough, shortness of breath, sinus congestion, and wheezing are frequent complaints. These symptoms are often attributed to allergies or asthma. And while mold allergy can coexist with CIRS, they are not the same thing. Allergy treatment will not resolve CIRS-driven respiratory symptoms.
Gastrointestinal
Nausea, abdominal pain, diarrhea, and constipation are common enough in CIRS patients that many receive an IBS diagnosis first. The relationship between CIRS and gut health is complex. Biotoxin-driven inflammation affects gut motility, the gut lining, and the microbiome. Until the biotoxin burden is addressed, GI symptoms tend to be stubborn and treatment-resistant.
Ocular
Red eyes, blurred vision, light sensitivity, and excessive tearing are frequently reported CIRS symptoms. These are easy to overlook or attribute to screen fatigue, but they reflect genuine inflammatory changes in the visual system.
Sensory and Neurological
Numbness, tingling, static shocks, vertigo, tremors, and a metallic taste in the mouth all fall under the CIRS symptom umbrella. These symptoms reflect the broad neurological impact of chronic biotoxin-driven inflammation and are among the symptoms most likely to be written off as “unexplained” by practitioners unfamiliar with CIRS.
Autonomic and Metabolic
Temperature dysregulation, excessive thirst, increased urinary frequency, night sweats, and appetite swings reflect dysregulation of the autonomic nervous system. This is the system responsible for regulating the body’s automatic functions. These symptoms often get attributed to hormonal imbalances or anxiety, but in CIRS they have a clear physiological driver.
The 37 Official CIRS Symptoms
The following symptoms are the ones specifically identified and validated in the peer-reviewed CIRS literature. This is the list that Shoemaker Protocol practitioners use clinically. It is not an exhaustive list of everything a CIRS patient might experience, but the core diagnostic symptoms.
- Fatigue
- Weakness
- Aches
- Cramps
- Unusual pain
- Ice-pick pain
- Headache
- Light sensitivity
- Red eyes
- Blurred vision
- Tearing
- Sinus congestion
- Cough
- Shortness of breath
- Abdominal pain
- Diarrhea
- Joint pain
- Morning stiffness
- Memory challenges
- Difficulty with word recall
- Challenges with focus or concentration
- Decreased assimilation of new knowledge
- Confusion
- Disorientation
- Mood swings
- Skin sensitivity
- Tingling
- Numbness
- Appetite swings
- Temperature dysregulation
- Increased urinary frequency
- Excessive thirst
- Static shocks
- Vertigo
- Tremors
- Sweats (especially night sweats)
- Metallic taste in the mouth
That’s a long list! And that breadth is exactly the point. CIRS is a whole-body illness. When you see this many symptoms across this many systems, a single-organ explanation isn’t going to cut it.
The 13 Symptom Clusters: How CIRS Is Actually Diagnosed
Knowing the 37 symptoms is useful. But having symptoms from this list doesn’t confirm CIRS on its own. Most of these symptoms appear in dozens of other conditions.
What matters is the pattern. Dr. Shoemaker organized the 37 symptoms into 13 distinct clusters. If a patient has at least one symptom from at least 8 of the 13 clusters, that symptom burden is considered consistent with a CIRS diagnosis.
Here are the 13 clusters:
| Cluster | Symptoms |
|---|---|
| 1 | Fatigue, Weakness |
| 2 | Headaches |
| 3 | Aches, Cramps |
| 4 | Pains – unusual, sharp, clawing or electrical |
| 5 | Light sensitivity, Red eyes, Blurred vision, Tearing of the eyes |
| 6 | Shortness of breath, Sinus issues, Cough |
| 7 | Abdominal pain, Diarrhea, Acid reflux |
| 8 | Joint Pain, Morning stiffness |
| 9 | Issues with Memory, Concentration, Word assimilation, Feeling confused or Disoriented |
| 10 | Mood swings, Appetite swings, Sweats, Challenges with temperature regulation |
| 11 | Thirst, Frequent urination, Static shocks |
| 12 | Numbness, Tingling, Taste abnormalities |
| 13 | Vertigo, Tremors, Skin feeling sensitivity to light touch |
Go through this table slowly. If you find yourself checking boxes in eight or more clusters, that’s clinically significant. Not definitive, but significant enough to warrant proper evaluation.
Beyond the 37: Additional CIRS Symptoms I See in Practice
The 37 symptoms above are the most well-researched and the ones used for formal diagnosis. But CIRS patients often present with additional symptoms that haven’t yet made it into the peer-reviewed literature. Here are some I see regularly in my clinic:
- Histamine intolerance:
- hives, itching, and skin rashes
- Orthostatic intolerance:
- lightheadedness or dizziness when standing
- Palpitations
- Nausea
- Raynaud’s phenomenon (cold, color-changing hands or feet)
- Burning sensations in the hands or feet
- Difficulty navigating familiar places
- Rigid muscles
- Ehlers Danlos (EDS) presentation
Many patients who present with Mast Cell Activation Syndrome (MCAS) turn out to have CIRS as the underlying driver. The mast cell reactivity is real but treating MCAS alone, without addressing the biotoxin burden, tends to produce limited and temporary results.
The VCS Test: A Simple First Screening Step
One of the most accessible first steps you can take is the Visual Contrast Sensitivity (VCS) test, available online through Surviving Mold.
CIRS affects the nerve responsible for detecting visual contrast a subtle but measurable effect. The VCS test assesses this in about 10 minutes. It’s not a definitive CIRS diagnosis, but it’s a useful screening filter: approximately 95% of people with confirmed CIRS fail the VCS test, while fewer than 2% of healthy controls do.
If you fail the VCS test and you have symptoms present in eight or more of the 13 clusters, there is a strong clinical case for pursuing formal CIRS testing.
What Comes Next: Formal CIRS Testing
A positive symptom screen and a failed VCS test are starting points, not a diagnosis. Formal CIRS diagnosis requires a full clinical evaluation, a detailed history, and a specific panel of blood markers. These labs measure inflammatory cytokines, hormonal regulators, immune markers, and genetic factors. All of which follow predictable patterns in CIRS.
This is where working with a Shoemaker Protocol-certified practitioner matters enormously. Not every practitioner knows which labs to order, how to interpret them in the context of CIRS, or how to build a treatment plan once the diagnosis is confirmed. The Shoemaker Protocol is the only peer-reviewed, validated treatment framework for CIRS, and following it correctly requires specialized training.
You Know Your Body
If you’ve read this far and something in this post has made you feel seen, if the symptom list looks like your life, if the clusters describe your experience, I want you to know that what you’re dealing with is real. It is physiological. It has a name, a mechanism, and a treatment pathway with a strong track record.
You don’t have to keep collecting acronyms that don’t quite fit. Start with the VCS test. Go through the 13 clusters. And if those point toward CIRS, let’s talk… Because this is exactly what I do.
