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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This prevents some of the complications that arise with outside opioid medications, including constipation, brain fog, slowed breathing, nausea, and drug tolerance and dependence.
—
Dr. Sanjay Gupta, CNN Money, 26 Aug. 2025
McBride said her symptoms began in her young teen years and included anxiety, hair loss, dry skin, fatigue, brain fog, heart palpitations and unexplained weight gain.
—Maria Morava, MSNBC Newsweek, 23 Aug. 2025
Your brain fog gets worse every month.
—Jodie Cook, Forbes.com, 19 Aug. 2025
Later symptoms can include facial paralysis, brain fog, numbness, swollen joints, and nerve damage.
—Cara Lynn Shultz, People.com, 31 July 2025
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Dr. Sanjay Gupta, CNN Money, 26 Aug. 2025
McBride said her symptoms began in her young teen years and included anxiety, hair loss, dry skin, fatigue, brain fog, heart palpitations and unexplained weight gain.
—Maria Morava, MSNBC Newsweek, 23 Aug. 2025
Your brain fog gets worse every month.
—Jodie Cook, Forbes.com, 19 Aug. 2025
Later symptoms can include facial paralysis, brain fog, numbness, swollen joints, and nerve damage.
—Cara Lynn Shultz, People.com, 31 July 2025
See All Example Sentences for brain fog
Cite this Entry
“Brain fog.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/brain%20fog. Accessed 5 Sep. 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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