brain fog

American  

[breyn fog, fawg] / ˈbreɪn ˌfɒg, ˌfɔg /

Also brain-fog,

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.

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Etymology

Origin of brain fog

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

Example Sentences

She said the patches helped relieve musculoskeletal and joint pain, night sweats, and brain fog.

From The Wall Street Journal

Within this group, 86% of U.S. patients reported experiencing brain fog.

From Science Daily

By comparison, brain fog was reported by 63% of patients in Nigeria, 62% in Colombia, and just 15% in India.

From Science Daily

Back in November, I posted a note on LinkedIn about brain fog.

From BBC

I dashed it out in about 10 minutes - how for the first time in my 20-year career, I ended up using notes while doing live TV news thanks to the perimenopause brain fog.

From BBC