You were right to keep looking.
You're not imagining it. The workup just hasn't gone far enough yet.
Everything checked out. But you still don't feel like yourself.
- Your cognition has declined but imaging and standard labs are normal
- You've been told it's stress, anxiety, or age
- Brain fog accompanies fatigue, even when you sleep enough
- You've been supplementing B12 but levels remain unstable
- You have never been tested for H. pylori as part of your cognitive workup
- Brain fog with word-finding trouble
- B12 supplements that don't hold the number steady
- A standard B12 test that looks fine while more sensitive markers come back low
- Mental fatigue that worsens through the day
- Ferritin below 30 ng/mL but called normal
- Trouble holding focus, or thinking that feels slow
- Fog that comes and goes with how well you feel overall
- hs-CRP that sits just above 1.0 mg/L without obvious cause
- A general mental dullness rather than one specific problem
- Brain fog alongside digestive changes
- Mood shifts accompanying the fog
- Symptoms that don't fit neatly into one diagnosis
A workup for the cognition that won't sharpen.
This guide is written for the patient whose mind feels half a step behind — whose neurology consult was clean, whose MRI was unremarkable, and whose energy keeps leaking out before the day ends. It maps four pathways by which an unsuspected H. pylori infection can shift cognition without showing up on a standard scan.
It is not a treatment protocol. It's the investigation itself, written down — so your next move is far more specific than your last, whether you take it to a doctor or pursue it on your own.
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i.
The clinical signature of brain fog with a clean workupHow the pattern differs from depression, ADHD, perimenopause, and post-viral fog — and the questions that route each one.
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ii.
Four pathways the cognitive workup missesB12 absorption, low usable iron, chronic inflammation, the gut–brain link — with the evidence tier for each.
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iii.
Why 'normal' B12 isn't enoughThe more sensitive B12 markers that reveal a shortfall a wide 'normal' range can hide.
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iv.
Labs to request beyond a basic panelMMA, homocysteine, hs-CRP, ferritin with sTfR — read together, not in isolation.
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v.
Testing options for H. pyloriStool antigen, urea breath test, biopsy — trade-offs, costs, and what each rules in or out.
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vi.
What positivity changesEradication, re-testing cognition with a structured battery, follow-up timeline.
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vii.
A script for raising itA practical framework for discussing testing, interpretation, and next steps — whether with your physician or as a self-directed investigation.
Sharper thinking. Clearer next steps.
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Know exactly what to investigate next — and why it's slipped through the standard workup so far.
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Tell the difference between 'normal' and 'fine for you' — and which numbers actually matter.
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Walk away with a specific plan to act on — with a doctor or on your own — instead of another dead end.
Three tiers. One rubric. No exceptions.
Every claim is tagged Strong, Moderate, or Exploratory — so you can see exactly how solid each one is. These four are the heart of why H. pylori is worth investigating in brain fog.
Brain fog · evidence summary
A few honest questions.
Is this medical advice?
No. This guide is educational — written to help you understand the evidence, evaluate testing options, and identify questions worth exploring with your healthcare team or on your own.
Why isn't my doctor already testing for this?
Because brain fog has many possible causes, and H. pylori is classified as a gastroenterological infection — so it rarely appears on the differential for cognitive symptoms in neurology or psychiatry. It's a gap between specialties, not a failing on your part. The guide shows you when investigation is warranted and exactly what to ask for — whether you raise it with a doctor or decide to pursue it yourself.
Do I need to buy the testing kit?
No — the guide is sold separately from any test or product. It covers all three testing options — stool antigen, urea breath test, biopsy — what each costs, and how to ask for it. But a test only tells you yes or no; the guide is what tells you which test to request and what to do with the result, which is where most people get stuck.
What if my labs are 'in range'?
The guide spends a section on this exact situation — what 'in range' obscures, what to look at in combination, and the secondary markers that frequently shift the picture without changing the headline numbers.
Refund policy?
14 days, no questions. If the guide isn't useful, the Lemon Squeezy receipt has a one-click refund link.
Who wrote it?
Researched, written, and medically reviewed by a physician on the Welyon team. Every claim is drawn from peer-reviewed literature and graded inline — Strong, Moderate, or Exploratory — so you can weigh the evidence behind each one yourself.
Start closing the gap between 'normal' and 'explained.'
Move from ruled out to figured out.
34 pages, eleven citations, four pathways, one clearer next step.
Many readers find more than one guide applies. Each is sold separately — or ask about bundle pricing at checkout.