Most common cause of primary hyperparathyroidism-
Most common cause of primary hyperparathyroidism is autonomous secretion of parathyroid hormone (PTH) by a parathyroid adenoma. Single adenoma (90%), multiple adenomas(4%), nodular hyperplasia(5%), carcinoma(1%). Reference : page 769 Davidson's Principles and practice of Medicine 22nd edition
Iatrogenic
Medullary carcinoma thyroid
Parathyroid adenoma
Parathyroid hyperplasia
Endocrinology