When you have thyroid surgery and you encounter a situation where the freezing is benign and the paraffin wax is malignant you will definitely have a big headache. The best time to operate again is within 3 weeks or 3 months after the first operation. 3 weeks later, the postoperative thyroid wound is still mainly in the edema phase of the inflammatory reaction, and the adhesions between the tissues are still mainly loose adhesions, so it is easier to separate the residual thyroid tissue from the laryngeal nerve and the parathyroid gland without causing damage. After 3 weeks, as the acute phase of the inflammatory reaction passes, the loose adhesions between the tissues will be replaced by dense fibrinous adhesions, which will persist for 3 months later. If surgery is performed at this time, the chances of damage to the recurrent laryngeal nerve and parathyroid glands are greatly increased, often resulting in more serious consequences, such as hoarseness and generalized twitching of the extremities. For patients who have undergone surgery outside the hospital, because they do not know much about the first surgery, they can usually determine the location and amount of residual thyroid gland through CT and other preliminary judgments to determine whether they should undergo another surgery.