Introduction: Another rare surgical cause of voice change after thyroidectomy is cervical muscle injury Causes of failure may include pulmonary edema, edema, or airway obstruction. The aim of this study was to determine the frequency of unplanned parathyroidectomy, unplanned parathyroidectomy, postoperative hypocalcemia and the risk of unplanned parathyroidectomy in patients undergoing thyroid surgery in our clinic. Material and Methods: Comparison of postoperative Ca value with age, gender, preoperative Ca value, dominant nodule diameter on ultrasonography (USG), type of surgery (total/lobectomy), and histopathological findings of thyroidectomy material (malignant/benign, with or without incident parathyroidectomy) is closed. Blood calcium levels below 8 mg/dL, measured after the first 24 hours after surgery, are indicative of postoperative hypocalcemia. Results: There was no relationship between nodule diameter and hypocalcemia. When patients were divided into malignant and benign groups, there was no significant difference between these groups in terms of performance after hypocalcemia. When patients were divided into groups with and without incident parathyroidectomy, there was no significant difference in postoperative hypocalcemia between these groups. Conclusion: In our study, female gender, age <28.5 years, low preoperative Ca value and total thyroidectomy were considered to be associated with hypocalcemia. Although there is no association between parathyroidectomy and postoperative hypocalcemia, this problem can be avoided by careful removal and imaging of the thyroid gland, especially in patients including patients with malignant thyroidectomy and total thyroidectomy.