Atropine is contraindicated prior to hyperthyroidism because its more significant effect is to cause a significant increase in heart rate. If thyroid surgery is performed in this state, postoperative hyperthyroidism is very likely to induce a hyperthyroid crisis, which is a serious postoperative complication of thyroid surgery and can endanger the patient’s life, so atropine should not be used. The preoperative preparation for hyperthyroidism is very strict. First of all, you should take oral anti-thyroid medication to keep your hyperthyroidism under stable control before surgery, so as to avoid post-operative hyperthyroid crisis caused by elevated thyroid hormone levels. Patients with hyperthyroidism should take a certain amount of iodine as recommended by the doctor before surgery. The purpose of taking iodine is to harden the thyroid gland and thus reduce the risk of bleeding after surgery. Patients with hyperthyroidism need to monitor their thyroid function after surgery, as some patients may develop hypothyroidism. If this occurs, oral eugenol will be required for replacement therapy.