Post-COVID syndrome, also known as long COVID-19, involves a wide range of health problems that occur many weeks, months and years after recovering from COVID-19 infection. Sometimes, symptoms of long COVID-19 can include cognitive difficulties. “Brain fog” has been used to describe some of these symptoms. While “brain fog” is not a medical condition, it’s a term used for certain symptoms that can affect one’s ability to think. In this Mayo Clinic Minute, Dr. Billie…