The incidence of primary hyperparathyroidism amongst the elderly has increased during the last decade. Recent studies show that the incidence has risen to 277 per million population after the introduction of automated techniques for measuring the serum calcium. The diagnosis of primary hyperparathyroidism in patients over 60 has increased fivefold in men and more than sixfold in women. Coincidentally there has been a diversity of clinical presentation and an increasing interest in the manifestation. We report three patients who presented with entirely different clinical pictures but who were proved to have primary hyperparathyroidism.