Some vocal cord paralysis can recover on its own. Vocal fold paralysis is caused by the dysfunction of the laryngeal nerve. There are many causes of vocal fold paralysis, usually the following: a. Viral infections, commonly herpes zoster virus infection, some cases can recover on their own. The majority of cases can not recover by themselves. Third, medical complications of surgery, such as thyroid surgery, if not directly cut or ligated by surgery, but caused by local bleeding compression and edema reaction, can recover by themselves. Idiopathic vocal cord paralysis, which means that after a thorough examination and no specific cause is found, most of them can recover on their own after 3-6 months.