Throat voice suddenly become hoarse, clinically there may be the following diseases: first, is acute laryngitis, this disease clinically the most common, the patient may be after a cold or bronchitis, pneumonia, coughing, etc., resulting in the vocal folds congestion, vocal cord edema, resulting in hoarseness. Clinical examination can see bilateral vocal folds can be adducted, but the closure is not tight, for this case can be applied antibiotics, nebulization and other symptomatic treatment; second, the patient may be secondary to trauma or surgery after the hoarseness of the voice, common thyroid surgery resulting in laryngeal recurrent nerve damage, neck trauma caused by the cricoarytenoid joint subluxation, tracheal intubation resulting in the patient’s cricoarytenoid subluxation, patients can suddenly appear hoarse; third, the patient may suddenly appear hoarse; third, this disease is most common clinically. can suddenly appear hoarse; third, some patients suddenly appear cerebrovascular disease, such as cerebral foothill, cerebral hemorrhage and other diseases compress the central nervous system, resulting in patients appearing to speak hoarse. Fourth, vocal cord swelling.