The coughing and wheezing sound is a symptom of respiratory system diseases, mainly due to the invasion of viruses, bacteria, mycoplasma, chlamydia, rickettsia and other pathogens, which cause inflammatory changes in the respiratory tract mucosa, including congestion, edema and exudation of inflammatory substances, and can be accompanied by contraction and spasm of the bronchial smooth muscle and relative narrowing of the airway. During the respiratory exercise, the exhaled gas vibrates the airway secretions and causes the sound of wheezing and coughing, which is the same as the sound of whistling.