[Primary hyperparathyroidism can be mistaken as pregnancy inconvenience]

This case report describes a pregnant woman with severe primary hyperparathyroidism. The symptoms, mainly nausea and vomiting, were not recognized as symptoms of hypercalcaemia, but ascribed to the pregnancy. As she was diagnosed, parathyroidectomy was performed and the symptoms ceased. Primary hyperparathyroidism in pregnancy can among other things cause pregnancy loss, intrauterine growth retardation and neonatal tetanus caused by hypocalcaemia. The case demonstrates the need for measuring serum calcium in pregnant women with severe hyper emesis and a record of unexplained miscarriages.