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Brain Fog
Brain fog is a symptom with multiple causes — identifying which ones are active makes treatment straightforward.
Brain fog — slowed thinking, poor memory, difficulty concentrating — is one of the most common complaints I hear and one of the most consistently underinvestigated. In the vast majority of cases, a thorough lab workup identifies specific, correctable causes: thyroid dysfunction, iron deficiency, insulin resistance, vitamin D or B12 deficiency, or neuroinflammation from gut dysbiosis. Finding the driver is what makes treatment work.
Thyroid Is Often the Culprit
Subclinical hypothyroidism — where TSH is within 'normal' range but free T3 is low — is one of the most common and most consistently missed causes of cognitive impairment and brain fog.
Ferritin Below 50 Impairs Cognition
Iron deficiency impairs myelin synthesis and cognitive function well before anemia develops. Ferritin below 50 ng/mL is associated with cognitive impairment regardless of hemoglobin — this is frequently missed on standard CBC.
Inflammation Crosses the Blood-Brain Barrier
Inflammatory cytokines from gut dysbiosis, metabolic syndrome, or autoimmune activity directly impair synaptic function and neuroplasticity — producing cognitive symptoms without any structural brain pathology.
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