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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Unexpected symptoms include inflammation that can cause acne, eczema, or skin irritations, fatigue, brain fog, or strong sugar cravings.
—
Mélanie Nauche, Vogue, 28 May 2026
Fatigue and brain fog belong on the list too since circulation affects cognitive function alongside physical performance.
—Allison Palmer, Miami Herald, 28 May 2026
Menopause can feel like a major turning point for millions of women, with symptoms like fatigue, weight gain, and brain fog can make women feel like their bodies aren't their own.
—Suzanne Le Mignot, CBS News, 24 May 2026
Millennials are quickly discovering that their symptoms – brain fog, frozen shoulder and itchy ears – are perimenopause, the years leading up to menopause when a woman still has her menstrual period but hormone levels fluctuate.
—Laura Trujillo, USA Today, 18 May 2026
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Mélanie Nauche, Vogue, 28 May 2026
Fatigue and brain fog belong on the list too since circulation affects cognitive function alongside physical performance.
—Allison Palmer, Miami Herald, 28 May 2026
Menopause can feel like a major turning point for millions of women, with symptoms like fatigue, weight gain, and brain fog can make women feel like their bodies aren't their own.
—Suzanne Le Mignot, CBS News, 24 May 2026
Millennials are quickly discovering that their symptoms – brain fog, frozen shoulder and itchy ears – are perimenopause, the years leading up to menopause when a woman still has her menstrual period but hormone levels fluctuate.
—Laura Trujillo, USA Today, 18 May 2026
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 1 Jun. 2026.
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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