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    Mold Illness Symptoms Checklist — 24 Signs You're Carrying a Mycotoxin Load

    Dr. Nicole Rivera·June 8, 2026·7 min read

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    Mold illness presents differently in everyone. If you have 5 or more of these symptoms — especially across multiple body systems — mycotoxin testing should be on the differential, particularly if there's any water-damage history in your current or recent buildings.

    Neurological / cognitive

    1. Brain fog, "thinking through molasses"
    2. Word-finding difficulty, names slipping
    3. Executive dysfunction — starting tasks feels disproportionately hard
    4. Anxiety with no clear trigger
    5. Depression that doesn't respond to standard care
    6. Headaches, often pressurised
    7. Tremor, twitching, or restless legs
    8. Light or sound sensitivity

    Hormonal / endocrine

    1. Low testosterone unresponsive to TRT (see low-T and mold)
    2. Cycle irregularity, sudden cycle loss
    3. Thyroid symptoms with "normal" labs
    4. Sudden weight changes (gain or loss) unexplained
    5. Fertility loss without other explanation

    Immune / mast cell

    1. Flushing, hives, food sensitivities multiplying (MCAS link)
    2. Recurrent sinus infections
    3. Recurrent UTIs or other infections
    4. New environmental allergies in adulthood

    Energy / mitochondrial

    1. Crashing fatigue, especially morning or post-meal
    2. Exercise intolerance — you used to train, now you can't
    3. POTS-like symptoms — dizziness on standing
    4. Sleep disturbance, especially 2–4am wake-ups

    Environmental signals

    1. Symptoms improve when away from home for 2+ weeks
    2. Symptoms worsen at work or after coming home
    3. Family members or pets also unwell in the same building

    Next steps

    • 5–10 symptoms: mycotoxin testing is reasonable. Start with VCS (free screening) + decide on urine mycotoxin panel.
    • 10+ symptoms with environmental signals: testing is strongly indicated. Begin environmental testing in parallel.
    • Any symptoms + known water damage: don't wait. Test now.

    For the full clinical picture, see our mold illness pillar. For how to test the building, see ERMI vs HERTSMI-2.

    Read next

    mold illness
    symptoms
    checklist
    mycotoxins
    CIRS

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