COVID-19 is a disease caused by a virus called SARS-CoV-2. Due to the intercontinental spread of this infectious disease, the World Health Organization declared the Covid-19 pandemic in March of 2020. The virus mainly binds to the host cell via the ACE2 receptor. The infection begins in the respiratory system where ACE2 receptors are richly expressed. Patients often present with respiratory symptoms of cough, sore throat and pneumonia. However, ACE2 receptors are widely distributed and are also found in the esophagus, enterocytes, myocardial cells and endothelial cells. Therefore, patients may also have diarrhea, arrhythmia or symptoms of thrombosis. Elderly and patiens with chronic diseases have an increased risk of developing a more severe clinical picture. 10-35% of patients with COVID report symptoms even six months after an acute infection, the so called post Covid syndrome. The most common symptoms are fatigue, dyspnea, cognitive impairment and chronic cough. Given that the respiratory system is the most common source of infection, many patients with severe viral infection present with both functional and radiological abnormalities of the lungs after an acute illness. Coagulation disorders also occur in 2-8% of patients. Thrombosis can be arterial and manifest as a stroke, myocardial infarction and limb ischemia or venous, manifested as deep vein thrombosis or pulmonary embolism.