Vocal fold insufficiency can be caused by a variety of reasons and usually does not heal on its own and requires targeted medication or even surgery. Vocal fold closure insufficiency means that the vocal folds do not close tightly enough when pronouncing words, and there are gaps, which can cause hoarseness in the patient’s voice. Inadequate vocal fold closure is mainly caused by the following factors. The first one is incomplete vocal fold closure caused by vocal fold masses, such as vocal fold polyps, vocal fold nodules, vocal fold swelling, etc. The swelling cannot subside on its own and requires medication to reduce the mucosal swelling or even surgical removal of the vocal fold polyp. Another cause is vocal fold paralysis, which is usually a problem with the nerve that governs vocal fold movement and usually does not heal on its own. It is recommended that the cause of vocal fold insufficiency be identified as soon as possible to ensure that the most appropriate treatment is available to restore the patient’s own pronunciation.