Most of them are not well prepared, which prevents the doctor from understanding the basic situation of the previous surgery and from making a good assessment of the current review, or even from giving clear instructions to patients who have problems or need another surgery. Therefore, we need patients to be prepared for the review, so that both doctors and patients are well informed. Preparation is as follows: Xuehai Bian, Department of Thyroid Surgery, China-Japan Friendship Hospital, Jilin University 1. Patients should come in person for review 2. Bring the imaging data of the previous surgery: (1) preoperative ultrasound, (2) surgical records, (3) postoperative pathology report (the above can be copied in the case room of the original surgery hospital) 3. Further consultation to clarify the nature of the disease. (You can borrow them from the pathology department of the original operation hospital) 4. 5. Thyroid function measurement: especially for patients with corresponding systemic symptoms; for patients taking oral exogenous thyroxine; for patients after total thyroidectomy for thyroid cancer, TGab is sensitive to tumor recurrence monitoring. For patients who are likely to need reoperation, parathyroid hormone (PTH) and calcium are mandatory tests, especially for patients with hypocalcemia. Patients who have had hoarseness should undergo fiberoptic laryngoscopy to observe the movement of the vocal cords and laryngeal electromyography if available. The above review preparations do not have to be met one by one, but the first and second preparations are relatively simple and should be done. Patients who have the corresponding symptoms and examination requirements should try to meet the above preparations. Good luck and good health to the patients!