Brain fog, explained without the hype
What actually causes it, what the evidence supports, and what is being sold to you. Written from experience and research, never pretending to be medical advice.
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Latest articles
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Nervous Exhaustion: What the Old Term Describes Today
Nervous exhaustion began as neurasthenia in 1869. Here is what replaced it: the WHO burnout definition and the Swedish exhaustion disorder criteria, quoted, plus what patients…
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Alcohol Brain Fog: What Clears Fast and What Lingers
Alcohol brain fog from a single night clears in hours by the body’s own measured rate; the fog reported weeks after quitting runs on a slower,…
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Brain Fog Period: What the Studies Actually Measured
Most people notice concentration trouble before their period, but the largest cognition studies find no reliable effect once cycle phase is confirmed by hormone testing.
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Brain Fog Headache: The Warning Signs That Need a Doctor
A brain fog headache is usually ordinary. Here are the combinations NICE and the NHS say need a doctor, quoted and dated, and why the top…
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ADHD Brain Fog: What the Diagnostic Criteria Actually Say
People with ADHD often describe brain fog, yet the phrase is absent from both diagnostic manuals. Here is what the criteria do list, the research construct…
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B12 Deficiency Brain Fog: Why One Blood Test Is Not Enough
Guidance lists brain fog among the signs of B12 deficiency, then disagrees with itself about what a borderline blood result means and which test should follow.
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Keto Brain Fog: What the Trials Measured, and Did Not
Starting a ketogenic diet is widely reported to bring fog, and keto is widely sold as a cure for it. Here is what the trials actually…
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Rheumatoid Arthritis Brain Fog: What the Studies Measured
What the research on cognition in rheumatoid arthritis actually measured, why the numbers disagree so wildly, and what people with RA report themselves.
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Do Brain Supplements Work? Not the Way They Are Advertised
What the brain supplement trials actually measured, why the label can promise focus without evidence, and what happened when a regulator tested those claims in court.
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UTI Brain Fog and Confusion: How Solid Is the Evidence?
What the guidelines, the reviews and a trial now running actually say about UTI brain fog and confusion, including where the sources openly disagree.
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Perimenopause Brain Fog: When Tests Come Back Normal
Fog often arrives before the calendar changes, a single FSH result is a snapshot of a moving number, and NICE’s own symptom list leaves brain fog…
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How Long Can Brain Fog Last? Timelines by Documented Cause
No guideline defines how long brain fog lasts, because it is not a diagnosis. Here are the documented timelines trigger by trigger, each with its source,…