A hypercalcemic crisis is a rare therapeutic emergency. However, it should not be overlooked, particularly during pregnancy, as it is associated with significant maternal and fetal morbidity and mortality. The most frequent etiology, including in pregnant women, is primary hyperparathyroidism. Knowledge of calcium-phosphate metabolism during pregnancy is important for understanding and interpreting the clinicopathological abnormalities observed in parathyroid pathology. Despite the expert consensus statement on parathyroid pathology issued by the European Society of Endocrinology, management of hypercalcemic crises remains poorly codified, particularly in pregnant women. Diagnostic examinations and hypocalcemia treatments are generally not recommended during pregnancy; however, it may be necessary to optimize preparation for surgery. Notably, surgery is the treatment of choice, particularly during pregnancy, when it should ideally be performed during the 2nd trimester. Therefore, a multidisciplinary approach is necessary. A consensus among European experts recommends systematic early detection of hypercalcemia during early pregnancy.