Often marked (40 - 41C)
Often out of proportion to fever 
May also have:
CHF
Palpitations
Dyspnea
Widened pulse pressure
A-fib
Hyperhidrosis
Thyrotoxic stare, lid retraction
Goitre
Tremor
Hepatomegaly
Jaundice
CHF
Palpitations
Dyspnea
Widened pulse pressure
A-fib
Hyperhidrosis
Thyrotoxic stare, lid retraction
Goitre
Tremor
Hepatomegaly
Jaundice
Cardiovascular collapse
Congestive heart failure
Hypotension
Cardiac dysrhythmias
Hypovolemia, hypotension
Due to nausea, vomiting, diarrhea
Hepatic failure with cholestatic jaundice 
Rare but carries poor prognosis
Congestive heart failure
Hypotension
Cardiac dysrhythmias
Due to nausea, vomiting, diarrhea
Rare but carries poor prognosis
Strikingly different rare form, dominated by depressed mental status, cardiac complications
Treatment with antithyroid therapy is still mainstay
More common in elderly patients
Thyroid storm
Sympathomimetic ingestion
Adrenal crisis
Atherosclerosis
Cushing's syndrome
Aortic regurgitation
Diabetic ketoacidosis
Thyrotoxicosis