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
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During lambing season, the smell of afterbirth left him with days of brain fog, fatigue, and joint aches.
—
Sarah Zhang, The Atlantic, 7 Oct. 2024
There may also be neurological symptoms such as dizziness, irritability, and brain fog (feeling mentally drained and unable to concentrate).6
High blood pressure itself doesn't usually cause headaches unless it is related to a medical emergency known as a hypertensive crisis.
—James Myhre & Dennis Sifris, Md, Verywell Health, 16 Dec. 2024
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
See all Example Sentences for brain fog 
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Sarah Zhang, The Atlantic, 7 Oct. 2024
There may also be neurological symptoms such as dizziness, irritability, and brain fog (feeling mentally drained and unable to concentrate).6
High blood pressure itself doesn't usually cause headaches unless it is related to a medical emergency known as a hypertensive crisis.
—James Myhre & Dennis Sifris, Md, Verywell Health, 16 Dec. 2024
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
See all Example Sentences for brain fog
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 8 Jan. 2025.
Copy CitationMedical 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)
Kylie Helgens, The Gazette (Cedar Rapids, Iowa)Love words? Need even more definitions?
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