Sudden hoarseness of the voice can not speak due to acute laryngitis, laryngeal nerve damage, vocal polyps and other diseases. 1. Acute laryngitis: acute diffuse inflammation of the laryngeal mucosa mainly in the vocal folds, mostly caused by infection, inhalation of hazardous gases, occupational factors and laryngeal trauma, etc., with a sudden onset of hoarseness, or even speechlessness, mild laryngeal pain, and increased laryngeal secretions. 2. Damage to the recurrent laryngeal nerve: the recurrent laryngeal nerve can affect the activity of the vocal cords, and if the recurrent laryngeal nerve is damaged on both sides, such as the recurrent laryngeal nerve is invaded by lung cancer and esophageal cancer, or the central nervous system that governs the movement of the vocal cords is damaged by the intracranial diseases, the function of the vocal cords will be incompetent, which will result in the case that the voice becomes hoarse and can’t speak suddenly. 3. Vocal polyps: most of them are caused by improper or excessive vocalization, and they can also be caused by a strong vocalization. The main manifestation of hoarseness, range and pitch change, pronunciation fatigue, serious cases can lead to complete loss of voice. Therefore, the sudden hoarseness of the voice can not speak may be caused by vocal polyps. Sudden hoarseness and speechlessness of the voice, it is recommended that timely hospital consultation, diagnosis and treatment.