States across the U.S. including New York, Michigan and Alabama experienced heavy fog on Jan. 24. (Video: John Farrell/The Washington Post) ...

Thick fog is causing problems for air travel in several parts of the U.S. on Friday morning as millions of people return home from the Christmas holiday. China warns US ally over plan to take back ...

Post-COVID ‘Brain Fog' May Be Caused by Changes in Spinal Fluid: Report Researchers at UCSF are trying to figure out what causes brain fog for some people with long term effects of COVID-19.

They found that the brain images showed more permeability or "leakiness" of the blood-brain barrier in patients who had long COVID with brain fog compared to the other groups. 24/7 Live San ...

On average, those with brain fog had an average of 2.5 cognitive risk factors, such as diabetes and high blood pressure, and those without brain fog had an average of less than one risk factor. In ...