Bilateral vocal cord paralysis caused by thyroid surgery may be related to anesthesia, recurrent laryngeal nerve injury and other reasons. 1. Related to anesthesia: generally due to anesthesia intubation injury damage to the vocal cords and vocal cord muscles, resulting in blocked vocal cord movement, you can choose gelatin sponge, hydroxyapatite, silicone, autologous fat, fascia and other substances injected into the deep part of the vocal cords to move them to the midline, thus relieving the symptoms. If the result is not satisfactory, thyroid chondroplasty or arytenoid chondroplasty can also be considered. 2. Laryngeal recurrent nerve injury: if the scope of tumor surgery is large, or there is adhesion or other phenomena during surgery, the laryngeal recurrent nerve may be mistakenly injured, resulting in vocal cord paralysis. There are two kinds of cases: one is only laryngeal recurrent nerve injury, surgery has mild stimulation or surgical instruments touch, the nerve is not completely broken, the paralysis may be partially recovered after a period of time; the second one is the nerve is completely broken, this kind of vocal cord paralysis is more difficult to recover, and we can only see if the opposite side of the vocal folds can compensate for the injury. Vocal cord paralysis laryngeal nerve injury needs to be treated under the guidance of a doctor, the rational use of nutritive nerve drugs, such as methylcobalamin tablets. At the same time, it is also necessary to carry out relevant vocal training, which is very helpful for the recovery of the disease. Patients should drink more warm water, eat more fresh vegetables and fruits, minimize the use of voice, more rest, can be observed for a period of time, if there is discomfort timely medical attention.