The first is acute laryngitis induced by respiratory tract infections, which are common in upper respiratory tract infections, such as colds, and lower respiratory tract infections, such as pneumonia, bronchitis, etc., resulting in repeated coughing, vocal cord congestion, edema, and even vocal cord polyps and other diseases that cause patients to become hoarse. In this case, it should not be difficult to diagnose by perfecting electronic laryngoscopy, lung films and other examinations. The second condition has patients with malignant tumors in the lungs, commonly known as lung cancer. Lung cancer causes patients to cough and cough up blood frequently, and because of the enlarged mediastinal lymph nodes caused by lung cancer compressing the recurrent laryngeal nerve, the patient develops hoarseness. This condition must be vigilant, and clinical examination can see vocal cord paralysis immobility and other related manifestations, and lung CT and other examinations can see signs of long lung tumors.