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

Recent Examples on the Web

Whether in the ocean, rivers, lakes, or your own personal cold plunge bath, enthusiasts claim that the therapy has a host of benefits, both mentally and physically, from reducing anxiety to reducing brain fog and improving focus. —Sara Novak, Discover Magazine, 27 Mar. 2025

Or what about another example, like the time a female colleague and CFO of a large hospital system, known for her ability to process complex data quickly, started experiencing brain fog? —Christine Schuster, Forbes, 25 Mar. 2025

During these years, women can experience fatigue, sleep disturbances, mood changes, brain fog, headaches and muscle and joint soreness. —Christine Schuster, Forbes, 25 Mar. 2025

My Menopause Center highlights that many menopause symptoms, such as anxiety, mood swings, depression, brain fog, memory issues, and fatigue, can contribute to low motivation and self-esteem. —Mark Davis, Newsweek, 16 Mar. 2025

Word History

First Known Use

1853, in the meaning defined above

Rhymes for brain fog

• agog
• backlog
• bulldog
• bullfrog
• eclogue
• eggnog
• groundhog
• hedgehog
• leapfrog
• prolog
• sheepdog
• watchdog

Medical 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)