The main goal of this article was to know if there was any relations statistically significant among the post-operative hypocalcemia, type of surgery for hyperparathyroidism in our series and its anatomopathological result (AP). 122 patients affected of such illness (30 men and 92 women) were studied and operated and we obtained 30 hypocalcemias (27 transitory and 3 permanent ones). The subtotal and total parathyroidectomies compared with adenomas removal have showed us a percentage for that complication significantly higher (p<0.001). Besides we have found a clear association between parathyroid hyperplasia and hypocalcemia (p<0.05).