brain fog

Also brain-fog,

[breyn fog, fawg]

noun

1. a mental state marked by difficulty remembering, concentrating, or thinking clearly, often caused by exhaustion, stress, or illness: For new parents, fatigue and brain fog seem inevitable.

   He had so much brain fog that a single thought felt impossible.

   For new parents, fatigue and brain fog seem inevitable.

   Research has found that long COVID can cause brain fog and memory loss.

Word History and Origins

Origin of brain fog¹

First recorded in 1850–55; brain ( def. ) + fog ¹ ( def. )

Example Sentences

Known as the "silent killer", hep C may cause few symptoms initially, with early signs including night sweats, brain fog, itchy skin and fatigue.

From BBC

"He wasn't the dad that I knew. He had a lot of brain fog, it affected him, it affected his personality."

From BBC

At the time of her diagnosis, Phillips said she had suffered months of brain fog and anxiety - and initially had attributed the symptoms to the menopause.

From BBC

The evidence includes heightened risk for stroke, breaching of the blood-brain barrier and “brain fog,” which can linger for months.

From Los Angeles Times

And for me, and many others, will it help clear our brain fog, a catch-all term that describes an inability to think clearly, string a sentence together, and remember the simplest of things?

From BBC