| Summary: | The ongoing or developing new symptoms after acute coronavirus disease-2019 (COVID-19) infection has emerged as a new clinical problem. This has become a problem facing the globally infected population and health systems. 'Long-COVID' can be defined as patients with laboratory-confirmed or clinically present COVID-19 whose symptoms persist for four weeks after diagnosis. Symptoms are remarkably heterogeneous, as seen in acute COVID-19. These symptoms may remain stable or fluctuate. Controversy over its definition complicates accurate diagnosis and management of the disease. The most prominent symptoms were fatigue, sleep disturbances, chest pain, and shortness of breath. Recent reports also highlight the risk of long-term sequelae in those recovering from acute COVID-19, affecting almost all organs such as the skin, respiratory system, cardiovascular system, neuropsychiatric system, and renal system. The long-term effects of COVID-19, in hospitalized and non-hospitalized individuals, across all age groups, should be a priority for future research with standardized and controlled studies.
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