The Ultimate Guide to the Causes of Brain Fog

    Reviewed by Dr. Alexandru-Theodor Amarfei, M.D. · Feb 2, 2026 · 18 min read POTS brain fog results from cerebral hypoperfusion (reduced blood flow to the brain) and autonomic hyperarousal when standing—not anxiety or dehydration. When you stand,...

Why your brain feels like cotton wool on keto—and the electrolyte fix that clears it in days. 📅 Updated: January 2025 ⏱️ 10 min read ✅ Medically Reviewed by Dr. Alexandru Amarfei, M.D. The Short Answer: Keto diet brain fog...

Hormonal brain fog is a clinical symptom strongly associated with endocrine dysregulation, not a psychological flaw. Fluctuations in estrogen, testosterone, and thyroid hormones are linked to changes in brain structure and function, including reduced cerebral glucose metabolism and disrupted neurotransmitter synthesis. However, individual responses vary significantly—not everyone with hormonal changes experiences cognitive symptoms, and multiple factors (sleep, stress, nutrition) interact with hormones to influence cognition.

✅ Medically Reviewed by: Dr. Alexandru-Theodor Amarfei, M.D. | Coordinator, Geriatric Medicine – CHIC Unisanté, FranceYou missed two hours of sleep last night. Today, you aren't just tired; you are clumsy. You can't find the right words. Your patience is thin. You...

✅ Medically Reviewed by: Dr. Alexandru-Theodor Amarfei, M.D. | Coordinator, Geriatric Medicine – CHIC Unisanté, France You eat a salad, and you look 6 months pregnant. An hour later, your brain shuts off. You feel drunk, clumsy, and irritable. You think it's...

✅ Medically Reviewed by: Dr. Alexandru-Theodor Amarfei, M.D. | Coordinator, Geriatric Medicine – CHIC Unisanté, France You eat a bagel or a bowl of pasta. You don’t get a stomach ache. You don’t get a rash. But two hours later, you can’t...