SARS-CoV-2 was initially identified as a respiratory virus, but it can affect the entire body, including the nervous system. In a new Viewpoint published in Science, Avindra Nath, M.D., clinical director of the National Institutes of Health’s National Institute of Neurological Disorders and Stroke (NINDS), and Serena Spudich, M.D., Yale School of Medicine, New Haven, Connecticut, highlight what is currently known about the effects of SARS-CoV-2 on the brain, the importance of increased research into the underlying causes of long COVID, and possible ways to treat its symptoms.