Bilateral vocal fold palsy is rare, and its root cause is not in the vocal folds, but in the laryngeal nerve that governs the vocal folds, so bilateral vocal fold palsy is a bilateral vocal fold movement disorder caused by bilateral laryngeal nerve paralysis (loss of function). Some patients have bilateral vocal cord movement disorders due to thyroid cancer, lung cancer or esophageal cancer invading the bilateral recurrent laryngeal nerve; some patients have bilateral laryngeal nerve injuries due to bilateral thyroid surgery, lung or esophageal open heart surgery; but some other patients have bilateral vocal cord paralysis for unknown reasons, which may be related to bilateral inflammation of the recurrent laryngeal nerve. Bilateral vocal fold paralysis clinical manifestations When the laryngeal nerve is damaged, the examination reveals that the vocal folds cannot be abducted, and the vocal folds cannot be opened during inspiration, and the two sides of the vocal folds are leaning together, so that the patient’s inspiratory volume is significantly reduced. When the patient is calm and inactive, he can still breathe, but after activity, he obviously feels that there is not enough air (inspiratory dyspnea), and the patient is very uncomfortable, and in severe cases, he may even die of suffocation. Bilateral vocal cord paralysis treatment Patients with bilateral vocal cord paralysis generally have breathing difficulties, and such patients must undergo tracheotomy as soon as possible to solve the patient’s breathing difficulties. Tracheotomy solves the patient’s breathing difficulties, but these patients have to wear a tracheal tube for life and keep their tracheotomy status all the time, which makes life very inconvenient. In order to remove the tracheal tube, the CO2 laser must be used to remove the arytenoid cartilage of one side of the vocal folds, so that the vocal canal can be enlarged, and only after the enlarged vocal canal can breathe normally can the tracheal tube be removed and the tracheotomy opening be sealed.