brain fog

noun

: a usually temporary state of diminished mental capacity marked by inability to concentrate or to think or reason clearly

Examples of brain fog in a Sentence

Recent Examples on the Web
These examples are automatically compiled from online sources to illustrate current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
In adults, the most common long COVID symptoms include fatigue and brain fog, but for children the condition can look different. Samuel Axon, Ars Technica, 27 Sep. 2024 Nearly 1 in 3 Americans may have an undiagnosed iron deficiency, a problem that can lead to fatigue, brain fog and difficulty concentrating, a new study suggests. Linda Carroll, NBC News, 24 Sep. 2024 About 7% of U.S. adults — nearly 18 million people — report enduring symptoms such as shortness of breath, extreme fatigue and brain fog. Jerome M. Adams, The Mercury News, 22 Oct. 2024 From food cravings to brain fog, blood sugar spikes may be the cause Want to live healthier longer? Sara Chernikoff, USA TODAY, 26 Sep. 2024 See all Example Sentences for brain fog 

Word History

First Known Use

1853, in the meaning defined above

Time Traveler
The first known use of brain fog was in 1853

Dictionary Entries Near brain fog

Cite this Entry

“Brain fog.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brain%20fog. Accessed 12 Nov. 2024.

Medical Definition

brain fog

noun
: a usually temporary state of diminished mental capacity marked by inability to concentrate or to think or reason clearly
This brain fog can be a result of being overly stressed, tired, carrying extra weight, consuming too many calories or consistently consuming a diet poor in nutrients.Kylie Helgens, The Gazette (Cedar Rapids, Iowa)
Last Updated: - Updated example sentences
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