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Long COVID or long-haul COVID (also known as post-COVID-19 syndrome, post-COVID-19 condition,[1][2] post-acute sequelae of COVID-19 (PASC), or chronic COVID syndrome (CCS)[3][4][5]) is a condition characterized by long-term health problems persisting or appearing after the typical recovery period of COVID-19. Although studies into long COVID are under way, as of May 2022 there is no consensus on the definition of the term.[6] Long COVID has been described as having the potential to affect nearly every organ system, causing further conditions (sequelae) including respiratory system disorders, nervous system and neurocognitive disorders, mental health disorders, metabolic disorders, cardiovascular disorders, gastrointestinal disorders, musculoskeletal pain, and anemia.[7]

The most commonly reported symptoms of long COVID are fatigue and memory problems.[8][9] Many other symptoms have also been reported, including malaise, headaches, shortness of breath, anosmia (loss of smell), parosmia (distorted smell), muscle weakness, low-grade fever, and cognitive dysfunction.[10] Overall, it is considered by default to be a diagnosis of exclusion.[11]

Estimates of the prevalence of long COVID vary based on definition, population studied, time period studied, and methodology, generally ranging between 5% and 50%.[12] Health systems in some countries and jurisdictions have been mobilized to deal with this group of patients by creating specialized clinics and providing advice.[13][14][15]