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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High cholesterol: High cholesterol levels have been linked to problems with memory and thinking (brain fog) in people with MS. High cholesterol can lead to plaque buildup in the arteries.
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Alexandria Nyembwe, Health, 20 July 2025
Anemia’s symptoms — tiredness, headaches, leg cramps, coldness, decreased ability to exercise, brain fog — are often attributed to aging itself, William Ershler, a hematologist and researcher said.
—Paula Span, Miami Herald, 18 July 2025
Anyone experiencing a combination of symptoms like fatigue, brain fog, abdominal discomfort, or sinus congestion should have a professional take a look around the home to assess if there are any signs of ongoing environmental exposure.
—Connie Etemadi, USA Today, 16 July 2025
Some of the symptoms include fatigue, brain fog, joint and muscle pains, weight fluctuations, depression, anxiety and hair loss.
—Michelle Lee, People.com, 11 July 2025
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Alexandria Nyembwe, Health, 20 July 2025
Anemia’s symptoms — tiredness, headaches, leg cramps, coldness, decreased ability to exercise, brain fog — are often attributed to aging itself, William Ershler, a hematologist and researcher said.
—Paula Span, Miami Herald, 18 July 2025
Anyone experiencing a combination of symptoms like fatigue, brain fog, abdominal discomfort, or sinus congestion should have a professional take a look around the home to assess if there are any signs of ongoing environmental exposure.
—Connie Etemadi, USA Today, 16 July 2025
Some of the symptoms include fatigue, brain fog, joint and muscle pains, weight fluctuations, depression, anxiety and hair loss.
—Michelle Lee, People.com, 11 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 30 Jul. 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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