Clinically, there may be the following diseases: First, it is acute laryngitis, which is the most common clinically. Patients may have hoarseness due to vocal fold congestion and vocal fold edema after a cold or bronchitis, pneumonia, cough, etc. Second, the hoarseness may be secondary to trauma or surgery, commonly caused by damage to the laryngeal nerve due to thyroid surgery, dislocation of the cricoarytenoid joint due to neck trauma, or dislocation of the cricoarytenoid due to tracheal intubation. can suddenly develop hoarseness; third, some patients suddenly develop cerebrovascular diseases, such as cerebral ridge congestion, cerebral hemorrhage and other diseases that compress the central nervous system, resulting in hoarseness of speech. Fourth, vocal fold swelling