The book offers a comprehensive overview of all parathyroid gland disorders both, benign and malignant. It emphases established concepts, presents the ongoing controversies, challenges and debates on diagnosis and treatment of different parathyroid gland disorders, with a view of clarifying some uncertainties, making suggestions to resolve others, and establishing strategies to reach therapeutic success.In addition to general information on parathyroid gland embryology, surgical anatomy, histology and physiology, the chapters explore hyperparathyroidism, osteitis fibrosa cystica, hypoparathyroidism, hungry bone syndrome, the importance of calcium in the human body and differential diagnosis of hypercalcemia. The last chapters investigate post-thyroidectomy hypocalcemia, thyroid cancer, recent intra-operative localizing tools, and illustrate new techniques of parathyroidectomy, as well as parathyroid transplantation. The book will be an invaluable and indispensable source of knowledge and reference for all specialists and trainees entrusted with the care of patients suffering from parathyroid disease.