Very few data has been published on the epidemiology of hypoparathyroidism worldwide: none exists specifically for France. Hypoparathyroidism could led to complications. Here, the investigators plan to collect data about both epidemiology, medication and complication of hypoparathyroidism in France.

Very few data has been published on the epidemiology of hypoparathyroidism worldwide. None exists specifically in France. Hypoparathyroidism could led to complications: e.g. symptomatic hypocalcemia, calcifications (brain, eye and other soft tissues), nephrolithiasis/nephrocalcinosis, renal insufficiency. Here,the investigators plan to collect data about both epidemiology, medication and complication of hypoparathyroidism in France.

Inclusion Criteria:

• patient fro whom chronic hypoparathyroidism is diagnosed
• patient living in France

Exclusion Criteria:

• patient who does not want his data to be collected in this registry
• pseudo-hypoparathyroidism
• acute hypoparathyroidism

All patients for whom hypoparathyroidism is diagnosed in France