Patients with cough feel out of breath difficulty mainly refers to the expiratory dyspnea, will feel the expiratory time is long, the patient will also have expiratory effort. In the clinic is common in chronic obstructive disease, chronic bronchitis, obstructive emphysema, bronchial asthma disease, are belong to the respiratory system of the common chronic diseases, will affect the expansion of the trachea, but also affect the elasticity of the trachea, will make the trachea spasm to become narrow, but also increase the secretion of the trachea blockage. In addition, it can also be seen in bronchial tumor, bronchial foreign body, pulmonary fibrosis, etc.; you need to go to the hospital to do the appropriate examination, such as blood routine, lung CT, lung function, etc., and according to the results of the examination to active treatment. It may also be caused by vegetative nerve dysfunction, or due to insufficient blood supply to the myocardium.