The clinical details of ten women with idiopathic oedema are presented and one is discussed in detail. The condition is characterised by an excessive diurnal weight gain with the development of peripheral oedema when the patient is in the upright position. Treatment is frequently unsatisfactory but should include, a full explanation, weight reduction, moderate sodium restriction, psychiatric assessment, no smoking and avoidance of prolonged standing. If this approach fails the smallest effective dose of a mild diuretic agent may be prescribed during an episode of fluid retention.