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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It is often diagnosed by a rash around the tick bite and can later lead to symptoms such as facial paralysis, brain fog, numbness, swollen joints or nerve damage.
—
Brenton Blanchet, People.com, 3 Aug. 2025
Bloating, brain fog, sluggish digestion... sound familiar?
—Jordi Lippe-McGraw, Forbes.com, 1 Aug. 2025
This can lead to body and brain inflammation, which causes symptoms like fatigue, anxiety, mood swings and brain fog, according to experts.
—Khloe Quill, FOXNews.com, 31 July 2025
Lyme disease, commonly transmitted through tick bites, can initially cause flu-like symptoms but may escalate to include joint swelling, brain fog, nerve damage, and even facial paralysis if untreated, according to Mayo Clinic.
—Amber Corrine, VIBE.com, 31 July 2025
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Brenton Blanchet, People.com, 3 Aug. 2025
Bloating, brain fog, sluggish digestion... sound familiar?
—Jordi Lippe-McGraw, Forbes.com, 1 Aug. 2025
This can lead to body and brain inflammation, which causes symptoms like fatigue, anxiety, mood swings and brain fog, according to experts.
—Khloe Quill, FOXNews.com, 31 July 2025
Lyme disease, commonly transmitted through tick bites, can initially cause flu-like symptoms but may escalate to include joint swelling, brain fog, nerve damage, and even facial paralysis if untreated, according to Mayo Clinic.
—Amber Corrine, VIBE.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 19 Aug. 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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