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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
Back pain isn’t the only health condition that plagued Mangione — the Reddit account included posts about brain fog and Lyme disease — but spondylolisthesis appears to have been the most taxing.
—Karen Kaplan, Los Angeles Times, 11 Dec. 2024
Again, while every woman’s experience is different, some very common symptoms include difficulty focusing or concentrating due to lack of sleep, interruptions from hot flashes, and brain fog, says Dr. Gunter.
—Jess Cording, Forbes, 9 Dec. 2024
The condition known as long Covid or post-Covid syndrome (PCS) can cause extreme tiredness, shortness of breath, brain fog, dizziness, heart palpitations and muscle aches lasting for 12 weeks or more, according to the Nice guidelines.
—The Week Uk, theweek, 8 Oct. 2024
Around 22% of long Covid patients are unemployed and unable to work due to chronic fatigue syndrome or myalgic encephalomyelitis and brain fog.
—Anuradha Varanasi, Forbes, 6 Nov. 2024
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Word History
First Known Use
1853, in the meaning defined above
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 22 Dec. 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)
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