Understanding Brain Fog
What is brain fog?
Brain fog isn't a diagnosis - it's your brain telling you something is off. Could be sleep. Could be thyroid. Could be three things at once.
Describe Your Pattern
What does your brain fog feel like?
Start Here
Where are you right now?
"I'm not sure if what I have is brain fog"
What brain fog is, what it feels like, when to worry, and what to do about it.
Read the explainer →"I want to figure out why I have brain fog"
Describe your pattern and compare it against 72 causes. Get a shortlist of what fits and what to test.
Map my pattern →"My blood work came back 'normal'"
Standard panels miss the most common brain fog causes. Here's what to actually ask for and why 'normal' doesn't always mean 'optimal.'
What to check first →"I just want something I can try today"
Free, low-risk experiments ranked by how often they actually help. Start with the basics.
Quick wins →Most Explored
Common causes people check first
Sleep problems
Heavy mornings, broken nights, never rested
Thyroid dysfunction
Fatigue, weight changes, cold sensitivity
Anxiety
Scattered thoughts, racing mind, can't land
Depression
Slow processing, poor memory, flat motivation
Long COVID / ME/CFS
Post-viral, crashes with exertion
Iron / Anemia
Fatigue, pale skin, especially in women
Nutrient deficiency
B12, D, magnesium - persistent low-grade fog
Sleep apnea
Snoring, waking tired, daytime sleepiness
Every claim linked to its source
Clinical frameworks by Dr. Amarfei
Correction policy - we publish our mistakes
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Cause directory