Of all the organs that are affected the most by COVID, lungs come first. This twin organ suffers the most during the coronavirus attack because of being a part of the respiratory system. As the infection caused by the coronavirus travels, it affects the lungs and airways. Gradually, when it is left untreated, the infection causes swelling and inflammation in the lungs.

from Times of India https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/coronavirus-complication-know-how-covid-damages-your-lungs/photostory/92516747.cms