This may happen if the vocal folds cannot close to protect the airway while swallowing. Causes of Vocal Fold Paralysis. Nerve damage causes vocal fold paralysis. The vagus nerve runs from the brainstem to the larynx. This nerve controls vocal fold movement. Anything that damages this nerve can cause paralysis. This includes head and neck …
https://www.asha.org/public/speech/disorders/Vocal-Fold-Paralysis/