Hoarseness is a common clinical condition. In addition to organic lesions of the vocal folds (neoplasia, structural abnormalities, etc.) in some patients, most patients suffer from incorrect vocal practices. In addition to causing hoarseness, these incorrect vocal habits can also cause chronic pharyngitis symptoms such as sore throat and dry throat, as well as being the main cause of some organic lesions of the vocal folds (e.g. vocal fold polyps, vocal fold nodules). Therefore, vocal training will become an important tool in the treatment of hoarseness-related diseases.