After hyperparathyroidism surgery, about 30% of patients experience numbness in the hands, feet or face, which is a normal postoperative reaction. Prior to surgery, the diseased parathyroid glands abnormally produce large amounts of parathyroid hormone, contributing to a significant increase in blood calcium levels. A few hours after the surgical removal of the diseased parathyroid gland, the parathyroid hormone level in the blood will drop significantly, and calcium in the blood will rapidly enter the bones within a few hours, resulting in a steep decrease in blood calcium levels, even though the blood calcium level may still be within the normal range at this time, the change is noticeable for the high blood calcium level that has been maintained for many years in the past, and therefore, a low blood calcium response will occur In the postoperative period, there may be reactions such as numbness of the face around the mouth, or numbness of the fingers or feet, or even twitching, or in severe cases, a drop in blood pressure. Therefore, calcium supplements are routinely started postoperatively to avoid too drastic a drop in blood calcium. After review, if the indicators such as blood calcium and bone density return to normal levels, calcium supplementation can be gradually stopped.