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What is All are TRUE about hyperparathyroidism, except - and explain in detail?
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.