• Chronic renal failure
• Phosphate therapy
• Calcitonin
• Diphosphonates
• Acute pancreatitis
• Congenital deficiency (DiGeorge’s syndrome)
• Idiopathic hypoparathyroidism (autoimmune)
• After neck operations
• Severe hypomagnesaemia
Pseudohypoparathyroidism
-Vitamin D deficiency
• Resistance to vitamin D