For some patients, COVID-19 is the uninvited visitor who won’t leave. These survivors have described a troubling array of persistent symptoms, including fatigue, insomnia, changes in smell and taste, shortness of breath, chest pain, palpitations, dizziness, depression, and anxiety. In some cases, the symptoms are disabling, preventing them from working or even going about their normal daily activities. In late February, the National Institutes of Health (NIH) gave this novel constellation of symptoms a formal name: postacute sequelae of SARS-CoV-2 infection (PASC).