[Gestational diabetes insipidus]

We report a case of transient diabetes insipidus in late pregnancy. This rare condition is characterised by excessive thirst and polyuria and is associated with pre-eclampsia. The aetiology is most likely due to increased vasopressinase activity. Suspected cases should be referred to an obstetric centre, since termination of pregnancy is recommended. The condition normally resolves within a few days of delivery.