A significant number of patients reports preserved symptoms after the suffered Covid -19, which lead to violation of everyday activity and worsen the quality of their life. One of the first term “Long-Covid” was used by the patient Eliza from Italy as a hashtag on Twitter in May 2020, describing her own experience of residual symptoms after recovery. In September 2020, a group of thirty -nine doctors, each of which suffered from the long -term consequences of Covid -19, joined the group of supporting patients with “constant symptoms of a suspect or confirmed Covid -19”, after which this term began to actively appear in the media and scientific publications. In December 2020, experts of the National Institute of Health and Medical Aid of Great Britain (National Institute for Health and Care Excellence, Nice) proposed a classification that includes the terms (up to 4 weeks from the beginning of symptoms), continuing symptomatic covid (4–12 weeks) and post -bond syndrome (> 12 weeks).