Science’s COVID-19 reporting is supported by the Heising-Simons Foundation. Since she fell ill with COVID-19 around Thanksgiving, Pamela Furr has been waiting for her old self to return. A radio news anchor in Tennessee for more than 10 years, she now sometimes finds herself stuck midsentence grasping for simple words; she is prone to forget events and conversations if she doesn’t write them down. “I’m not the same person that I was before COVID,” she says. “I kind of miss me.” The true prevalence of cognitive problems in COVID-19 survivors is elusive, and the underlying causes of lingering symptoms are the subject of ongoing studies. But it’s now clear that trouble thinking, concentrating, and remembering can be among the most debilitating “long-haul” symptoms and can persist for months. As more and more people seek help to overcome their brain fog at clinics set up for post–COVID-19 care, researchers and physicians are turning to treatments developed for stroke and traumatic brain injuries. And a few are setting out to test cognitive training video games they hope will expand the reach of therapy.