COVID-19 is primarily a lung disease caused by the SARS-CoV2 virus. However, the effect on the whole person must be considered regularly. Thus, there is often involvement of the vascular system, heart, kidneys and other organs. In the majority of patients, the course of the disease is mild and no special follow-up care is required. However, some patients become severely ill and require hospitalization and possibly even intensive medical care if pneumonia is present. After a severe course of the disease, many patients have persistent symptoms. In addition, after the initial improvement, some patients may develop complications due to scarring of the lungs or impaired blood flow to the lungs. The goal of structured follow-up care is to identify and treat the cause of persistent complaints. Of utmost importance here is the prevention of permanent damage.