Laryngoscopy for thyroid surgery is done mainly to determine whether there is any paralysis of the vocal cords before surgery, to understand the functional status of the vocal cords as well as whether there is any tracheal compression. Laryngoscopy for thyroid surgery has become a routine examination and is an indispensable part of every patient’s treatment for thyroid-related diseases. 1. Most patients suffer from vocal cord paralysis before surgery, but their speech is normal. Laryngoscopy can determine whether the paralysis is primary or the result of previous surgery. Vocal cord paralysis may also indicate the possibility of tumor infiltration. 2. To find out the functional status of the vocal folds, which can be used as a comparative information of whether there is any nerve damage after surgery. 3. To find out whether there is tracheal compression. Some thyroid-related diseases may cause enlargement of the thyroid gland or the presence of lumps, and the size of the thyroid gland, which is located in front of the trachea, may affect the shape of the trachea. It is recommended to follow the doctor’s instructions when performing thyroid surgery related tests and to carry out reasonable and standardized tests and diagnostic and therapeutic means.