Pulmonary dyspnea mainly refers to the respiratory disease, resulting in the patient subjectively feel the feeling of insufficient air, or respiratory effort, objectively manifested as changes in respiratory frequency, depth or rhythm, according to the pathogenesis of dyspnea can be classified into the following three categories: 1, inspiratory dyspnea: the patient feels effort when inhaling, manifested as wheezing, and inhalation can be seen in the triple concave sign, commonly found in the larynx or tracheal stenosis caused by inflammation or edema or tumor. Tracheal stenosis, such as laryngeal or tracheal stenosis caused by inflammation, edema or tumors, etc. 2, expiratory dyspnea: mainly when exhaling effort, respiratory phase prolongation, there can also be wheezing, mainly in asthma, chronic obstructive pulmonary disease patients. 3, mixed dyspnea: mainly when exhaling and inhaling both feel the effort, mainly seen in a wide range of lung disease, such as severe pneumonia, pulmonary fibrosis, massive pleural effusion, etc.. , large amount of pleural effusion, etc.