Pulmonary embolism is a pulmonary vascular lesion and does not present with rales, which are seen in wheezing with airway spasm. Signs of pulmonary embolism mainly include signs of the circulatory system and respiratory system. 1. Signs of the circulatory system: the main manifestations are tachycardia, blood pressure changes, severe blood pressure drop or even shock, abnormal jugular venous pulsation, abnormal jugular venous filling. 2. Signs of respiratory system: mainly manifested as cyanosis of lips and mouth, shortness of breath. However, symptoms of pulmonary embolism are often atypical and can have a variety of manifestations. Syncope can be the only or first symptom of pulmonary embolism, or there can be unexplained shortness of breath and dyspnea, which is especially pronounced after activity, and is one of the most common symptoms of pulmonary embolism, but also manifested as chest pain, hemoptysis, coughing, palpitations and so on. Patients with pulmonary embolism should go to the hospital in time for examination and treatment under the guidance of the doctor.