Category: Symptoms

How long sleep inertia lasted in three sources, why waking after eight hours can test worse than a night awake, what made it heavier in the…

The cognitive fatigue research in plain language: the Paris glutamate study and the effort choice paper by design, the critics, and what it means outside the…

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…

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…

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,…

A heavy, pressured head with fog on top is usually tension, sinuses, short sleep or painkillers. A published red flag list names the features that change…

Brain fog and blurred vision often travel together for ordinary reasons. Here is what NHS and eye institute guidance links to the pair, and the sudden…

Sleepiness, physical fatigue and mental fatigue are three different states that English collapses into one word. Here is what separates them, what the evidence shows, and…

What emotional exhaustion is reported to feel like, the cognitive deficits measured in burnout research, where the classification disagrees with the popular articles, and what people…

The word foggy gives a clinician almost nothing to work with. Here is what a doctor is listening for, what the usual tests actually find, and…

A fuzzy head has no location and no scale, and the faculty you would use to describe it is the one that is not working. What…

What brain fog actually feels like, which symptoms cluster together, and why a symptom list cannot tell you what is behind yours.