The causes of hoarseness are related to physiological factors and laryngeal disorders. 1. Physiological factors: for teachers and singers and other professional people, because of habitual excessive use of voice, may cause vocal folds edema, resulting in hoarseness symptoms. 2. Laryngeal disorders: If the patient has acute laryngitis disease, may also be due to inhalation of harmful gases, infectious factors, diffuse congestion and edema of the vocal cords, so that the patient produces hoarseness symptoms, serious loss of voice. Laryngeal chronic laryngitis, vocal cord nodules, vocal cord polyps, vocal cord paralysis, laryngeal cancer, etc., and these diseases may be due to chronic inflammation of the vocal cords, vocal cord neoplasm, and the vocal cord area caused by compression, which in turn causes the patient to appear to speak hoarse symptoms. Laryngeal-specific infections such as laryngeal tuberculosis can also cause hoarseness. It is recommended that patients with hoarseness should under the guidance of a professional otolaryngologist, improve the relevant examination to determine the cause before treatment and therapy.