There are many causes of shortness of breath, which can be caused by heart disease or respiratory disease, and the common causes are as follows: 1, acute bronchial infections, such as acute bronchitis, tracheitis, bronchiectasis when severe causes airway spasm appears shortness of breath; 2, acute exacerbation of chronic inflammatory airway diseases, such as acute attacks of asthma appear wheezing, shortness of breath, acute attacks of chronic obstructive pulmonary disease appear chest tightness, shortness of breath 3, pulmonary vascular diseases, such as pulmonary embolism patients appear chest tightness, chest pain, dyspnea, serious cases may appear syncope, sudden death; 4, patients with pneumothorax or pleural effusion prone to shortness of breath, pneumothorax usually exists in patients with genetic diseases, the patient is long and thin, the lungs appear small large bubbles, lifting heavy objects, laughing or inadvertent reaching movements may lead to the rupture of large bubbles, pneumothorax, occurring Respiratory distress occurs and gradually worsens. Pleural effusion imaging shows unilateral or bilateral accumulation of fluid in the lungs, causing lung expansion insufficiency, leading to dyspnea; 5, interstitial lung diseases, such diseases involve the lung parenchyma, leading to pulmonary diffusion dysfunction, causing a decrease in diffusion function, leading to hypoxia, causing dyspnea, such as pulmonary fibrosis; 6, cardiac causes, including arrhythmias, such as recurrent premature beats, frequent premature beats, coronary artery disease or hypertensive heart disease Patients present with heart failure or dyspnea.