Pulmonary embolism is the third most common cardiovascular disease. The incidence of pulmonary embolism is 90/10000 inhabitants. Venous thromboembolism is a disease that includes deep vein thrombosis and its most common complication - pulmonary embolism. Pulmonary embolism, or more precisely pulmonary artery embolism, is the blockage of the pulmonary artery or its branches by a solid, liquid or gaseous mass. Embolus in 99% of cases is caused by a thrombus, so we call it thromboembolism. Obstruction of the vascular system occurs by a thrombus that in 95% of cases originates from the deep veins of the legs. It manifests in various forms, from asymptomatic form to massive pulmonary embolism with right heart dysfunction. The clinical picture is dominated by dyspnea. It also occurs in the form of hyperventilation, arterial hypotension, as a pulmonary infarction, acute pulmonary heart with the development of cardiogenic shock, or as acute pulmonary hypertension with right ventricular dysfunction. Most pulmonary emboli are often asymptomatic and physiologically insignificant. Larger emboli cause acute dyspnea and tachypnea, pleural chest pain, and rarely cough and hemoptysis. Massive pulmonary embolism occurs abruptly with tachycardia, hypotension, syncope, or cardiac arrest. Diagnosis is made based on clinical picture, medical history, physical examination, lung X-ray, ECG, pulmonary angiography, and pulse oximetry. Pulmonary embolism is treated with anticoagulant therapy, thrombolytic therapy and surgical thrombectomy. Nurses play an important role in preventing pulmonary embolism. The nurse's duty is to encourage and / or perform passive and active lower limb exercises, encourage the patient to do deep breathing exercises, correct posture and change position in bed, put on elastic bandages and socks and encourage the patient to get out of bed and walk as soon as possible.