This condition is mainly caused by inspiratory dyspnea, which will be manifested as a significant effort to inhale, if the symptoms are more serious, it is likely to cause open-mouth breathing, sitting breathing, there will be the typical three concave signs, also accompanied by inspiratory laryngeal sounds, with obstruction, stenosis of the large airways, or the laryngeal edema is very prone to this phenomenon. If it is caused by acute laryngitis, the patient needs to be admitted to the hospital urgently, need to quickly correct the state of hypoxia, usually need to use glucocorticoid drugs to relieve laryngeal edema, also need to use effective antimicrobial drugs to control the infection, if the symptoms of the more critical time can be done tracheotomy to relieve the symptoms, to be able to avoid the occurrence of serious complications. In addition, pneumothorax or pleural effusion, this can also occur, chest X-ray may be quick to clarify the diagnosis, need to perform thoracentesis or closed drainage treatment.