brain fog

noun

: a usually temporary state of diminished mental capacity marked by inability to concentrate or to think or reason clearly

Example Sentences

Recent Examples on the Web

California Fatigue, cough and brain fog. —Sandhya Kambhampati, Los Angeles Times, 15 Apr. 2023

And those most common symptoms people complain about, fatigue, devastating fatigue, like can't get out of bed to take a shower kind of fatigue, brain fog, can't remember phone numbers or names. —Taylor Wilson, USA TODAY, 14 Mar. 2023

Gibbons, 32, of New York City, had heard it could be used to alleviate symptoms of brain fog. —Berkeley Lovelace Jr., NBC News, 4 Feb. 2023

These might include fatigue, difficulty breathing and chest pain, headache and brain fog, digestive problems, and other symptoms like stomach, joint, or muscle pain, per the Centers for Disease Control and Prevention. —Brigid Kennedy, The Week, 9 Dec. 2022

Symptoms like those Maxanne had—extreme fatigue, pain, involuntary tremors and spasms, dizziness, brain fog, and general malaise—have persisted throughout history, and medicine has never quite known what to do with them. —Natalie Shure, The New Republic, 8 Dec. 2022

Lucas had brain fog, fatigue, and depression. —Kaiser Health News, oregonlive, 23 Nov. 2022

Signs of the malady can include breathing problems, brain fog, chronic coughing, changes in taste and smell, overwhelming fatigue, difficulties in performing daily life functions, and disruptions in sleep that can last months, even years, after the infection has cleared the body. —Sandee Lamotte, CNN, 18 Sep. 2022

The symptoms are very nonspecific: Anxiety, depression, fatigue, brain fog. —Amanda Gokee, BostonGlobe.com, 4 Apr. 2023

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Word History

First Known Use

1853, in the meaning defined above

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)