True about thyroid storm -

Thyrotoxic crisis, or thyroid storm, is rare and presents as a life-threatening exacerbation of hypehyroidism, accompanied by fever, agitation, confusion, delirium, seizures, coma, vomiting, diarrhea, jaundice, hypeension, tachycardia or atrial fibrillation and in the older patients, cardiac failure. Thyrotoxic crisis is usually precipitated by acute illness (e.g., stroke, infection, trauma, diabetic ketoacidosis), surgery (especially on the thyroid), or radioiodine treatment of a patient with paially treated or untreated hypehyroidism. Reference : page 2297 Harrison's Principles of Internal Medicine 19th edition