About a third of diagnosed COVID-19 patients will have some type of neurological symptoms including seizures and strokes. We don’t have solid data on how many will battle brain fog, but many report it. “Even still today, with this interview, I’ve got a notebook sitting right here.”What causes COVID brain fog? Post-COVID brain fog is being studied. If you’re suffering from brain fog or other memory issues, it’s important to tell your doctor because there are steps you can take to help your brain recover.