All are TRUE about hyperparathyroidism, except -

Thyroid crisis or storm -  It is a rare disorder nowadays  It is an extreme form of thyrotoxicosis which is precipitated by stressful illness, thyroid surgery or Radioiodine administration.  It presents with symptoms of thyrotoxicosis which are -  Severe tachycardia, Arrhythmias  Marked delirium  Vomiting  Diarrhoea Dehydration  High fever  The mortality rate is very high.