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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Long COVID symptoms may include fatigue, brain fog, heart palpitations, trouble sleeping, and shortness of breath.67
Causes
Different viruses cause the common cold and COVID.
—
Lindsay Curtis, Health, 22 May 2025
Symptoms include persistent fatigue, muscle aches, joint pain, headaches, brain fog, shortness of breath and difficulty sleeping, per the Virginia Department of Health.
—Tess Demeyer, New York Times, 21 May 2025
Many people experience lapses in memory, brain fog, or trouble finding words, Dr. Rosenbloom says.
—Carolyn L. Todd, SELF, 12 May 2025
The list included anxiety, medical trauma, brain fog, insomnia, depression, menopause, grief, infertility, loneliness, fear of dying and more.
—Vanessa Etienne, People.com, 24 Apr. 2025
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Lindsay Curtis, Health, 22 May 2025
Symptoms include persistent fatigue, muscle aches, joint pain, headaches, brain fog, shortness of breath and difficulty sleeping, per the Virginia Department of Health.
—Tess Demeyer, New York Times, 21 May 2025
Many people experience lapses in memory, brain fog, or trouble finding words, Dr. Rosenbloom says.
—Carolyn L. Todd, SELF, 12 May 2025
The list included anxiety, medical trauma, brain fog, insomnia, depression, menopause, grief, infertility, loneliness, fear of dying and more.
—Vanessa Etienne, People.com, 24 Apr. 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 May. 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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