brain fog: meaning, definition, pronunciation and examples

No, it is a descriptive, symptomatic term used by patients and clinicians to communicate a subjective experience of cognitive dysfunction. It is not itself a diagnosis but a symptom of various conditions.

Common causes include stress, anxiety, lack of sleep, hormonal changes, nutritional deficiencies, certain medications, and post-viral conditions like Long COVID.

It is increasingly accepted in medical and wellness literature, often in quotation marks ('brain fog') to acknowledge its informal origin. In very formal academic writing, terms like 'cognitive dysfunction' or 'mental clouding' may be preferred.

Yes. While fatigue often accompanies it, brain fog specifically refers to the cognitive symptoms—confusion, forgetfulness, lack of focus—rather than the physical feeling of tiredness alone.

A temporary state of mental confusion, lack of clarity, and inability to concentrate or think clearly.

Brain fog: in British English it is pronounced /ˈbreɪn ˌfɒɡ/, and in American English it is pronounced /ˈbreɪn ˌfɑːɡ/. Tap the audio buttons above to hear it.