Hypoparathyroid

Underproduction of parathyroid hormone despite low calcium. Much rarer than hyperparathyroidism 

Primary

Causes

• DiGeorge syndrome
• Autosomal dominant hypoparathyoidism
• Pseudohypoparathyroidism Type 1A - bones + kidney don't respond to parathyroid hormones - defective parathyroid hormone receptor
• Surgical damage to the gland after thyroidectomy

Symptoms of hypocalcemia and hyperphosphatemia (table)

 

Secondary

Depression due to chronic hypocalcaemia, would likely accompanied by signs of hypocalcaemia