There is no such thing as recognizing 7 types of coughs by the sound of the cough, but there may be some value in determining the cause of a cough by the sound of the cough. Cough is a common respiratory symptom, most often seen in respiratory diseases, but may also be seen in other causes. There may be value in determining the cause of a cough by the sound of the cough. For example, a cough accompanied by hoarseness is most often caused by vocal cord lesions or compression of the recurrent laryngeal nerve, and a metallic cough may be caused by compression from mediastinal tumors, aortic aneurysms, bronchial cancers, and so on. However, the sound of the cough alone is not enough to determine the cause of the cough, and it needs to be evaluated by the doctor in conjunction with other clinical features, as well as chest CT and other relevant examinations to further clarify the diagnosis.