Lung inflammation and blood clots caused by covid-19 can lead to scarring and long-term breathlessness and coughing in some people, for which there is no treatment
Source:
https://www.newscientist.com/article/2247086-the-coronavirus-is-leaving-some-people-with-permanent-lung-damage/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home