Mold illness
CIRS (chronic inflammatory response syndrome), mold-related illness
Chronic conditionSymptoms linked to living or working in a damp, moldy building. The effects on the airways are well established, while a body-wide illness from mold is still debated.
Medical Disclaimer
For education only — this guide can't diagnose you. If these signs sound familiar, talk with a healthcare provider. Book a consult
What happens
Mold grows wherever water collects, such as after leaks, floods, or poor ventilation. Large reviews by the World Health Organization and the US Institute of Medicine found that damp, moldy buildings clearly worsen asthma and cause cough, wheeze, and nose and throat symptoms. In some people mold also causes allergies or, rarely, an inflammatory lung reaction called hypersensitivity pneumonitis. Some practitioners describe a wider illness called CIRS, with fatigue, brain fog, and pain. Your symptoms are real, but CIRS isn't accepted by mainstream medical groups, and urine mycotoxin tests haven't been shown to diagnose it. The most proven step is finding and fixing the moisture, or leaving the exposure.
Who gets it
People with allergies or asthma are most affected, along with anyone whose immune system is weakened. Risk is higher in water-damaged, flood-affected, or poorly ventilated housing. Adult asthma is more common in women, and pregnancy can change how well asthma is controlled.
Signs worth getting checked
- Stuffy or runny nose, sneezing, and sinus pressure
- Cough, wheezing, or chest tightness
- Asthma that's harder to control at home or work
- Itchy, watery eyes or a scratchy throat
- Shortness of breath, fever, or aches a few hours after exposure
- Fatigue, headaches, or trouble concentrating
- Symptoms that ease when you're away from the building
Labs to ask about
- Skin prick testing or IgE blood tests for common molds
- Spirometry, and sometimes other breathing tests
- CBC with differential (eosinophils) and total IgE
- Chest imaging if hypersensitivity pneumonitis or a fungal lung infection is suspected
- TSH, ferritin, B12, and vitamin D to look for other causes of fatigue
Treatments your doctor may discuss
- Fixing the source of moisture and removing mold, or leaving the exposure
- Allergy care, such as steroid nasal sprays, antihistamines, and sometimes immunotherapy
- Asthma care with an action plan and controller inhalers as needed
- Steroids and strict avoidance for hypersensitivity pneumonitis
Supportive steps to discuss with your provider
- Keep indoor humidity below 50% and fix leaks within 24 to 48 hours.
- Use exhaust fans in bathrooms and kitchens, and a HEPA filter in the bedroom.
- Hire a qualified professional for mold larger than about 10 square feet.
- Ask what a test can and can't show before paying for urine mycotoxin panels or CIRS lab panels.
- Ask about the evidence and side effects before starting binders such as cholestyramine.
See a doctor promptly if you have
- Severe trouble breathing, or lips turning blue: call 911
- Wheezing or shortness of breath that your rescue inhaler doesn't relieve: go to the emergency room
- Fever, cough, and breathlessness that return each time you're in a building
- A weakened immune system and a new cough, fever, or chest pain
- Symptoms that don't improve after the moisture is fixed
Related conditions
Ready to find the root cause?
Dr. Lesher is a Naturopathic Doctor who focuses on autoimmune and chronic conditions in women. Since 2020, she's helped hundreds of patients stop managing symptoms and start healing.