Total thyroidectomy is mainly used for patients with thyroid cancer, and a small number of patients with huge bilateral benign thyroid nodules will also undergo total or near-total surgery, with the following post-operative effects: 1. The risk of complications from total thyroidectomy is higher than unilateral, such as post-operative bleeding, and more serious bleeding can compress the trachea, leading to breathing difficulties and even asphyxia, requiring another operation to stop the bleeding; 2. The risk of nerve damage is also increased with total thyroidectomy. Damage to the recurrent laryngeal nerve can cause vocal cord paralysis, resulting in hoarseness, and even asphyxia if damaged bilaterally, and damage to the superior laryngeal nerve can cause choking and coughing when drinking; 3. Bilateral total thyroidectomy may damage the parathyroid glands, and even if the parathyroid glands are not removed, the blood flow of the parathyroid glands may be affected, resulting in reduced parathyroid function, causing hypocalcemia, and the patient will A few patients with total thyroidectomy may develop permanent hypoparathyroidism, which can only be treated with long-term calcium supplementation and some active vitamin D3. 4. After total thyroidectomy, patients need to take oral thyroxine tablets for a long time, and need to be reviewed regularly. It may cause patients to develop decalcification and osteoporosis.