Transient hypocalcemia is a well–recognized occurrence after thyroid surgery.We performed a cross–sectional review on 50 thyroidectomies from SLIMS hospital. Pre–operative vitamin D levels and post–operative calcium level were obtained. Early calcium and vitamin D supplementation had positive effects to treat hypocalcemia postoperative thyroidectomy. Transient hypocalcemia appears to occur less frequently in patients with LVD. Multivariate logistic regression analysis suggests that vitamin D could be predictive for post–thyroidectomy hypocalcemia, with lower vitamin D levels associated with less risk of hypocalcemia.