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After any coronavirus disease 2019 (COVID-19) illness, no matter how serious, some people report that symptoms stay for months. This lingering illness has often been called long COVID or post-COVID-19 syndrome. You might hear it called long-haul COVID or post-acute sequelae of SARS-CoV-2 (PASC).

There is no universal definition of long COVID right now.

In the U.S., some experts have defined long COVID as a long-lasting, called chronic, condition triggered by the virus that causes COVID-19. The medical term for this is an infection-associated chronic condition.

As researchers learn more about long COVID, this definition may change.