Although endocrine pathology is usually treated in an outpatient clinic, intensive care may be required when endocrinopathies are associated with other medical illnesses or reach a state of decompensation. Although endocrine emergencies are quite rare, they are potentially life-threatening if not recognised promptly and managed effectively. Therefore, every clinician should always be attentive to a possible diagnosis of these complex disorders. The three major diabetic emergencies comprise diabetic ketoacidosis, hyperglycaemic hyperosmolar state, and prolonged hypoglycaemia. Hyperglycaemic crises are characterised by hypovolaemia and electrolyte disturbances, and may be triggered by potentially life-threatening conditions. Hence, airway-breathing-circulation securement, early fluid resuscitation, and adequate diagnosis and treatment of the underlying condition are the cornerstones of acute management. Subsequently, monitoring and correction of electrolyte disturbances and insulin treatment are initiated. Profound hypoglycaemia should be suspected in every patient with coma of unclear etiology, especially if the patient has an indistinct history or was treated with insulin or sulfonylurea/meglitinide. This condition warrants an immediate administration of glucose, followed by regular blood glucose monitoring. Alternatively, glucagon may be injected subcutaneously, or preferably intramuscularly. Hyperglycaemia in critically ill patients is associated with adverse outcome. The optimal blood glucose target for critically ill patients remains unclear, however. In any case, clinicians should prevent severe hyperglycaemia, hypoglycaemia and large glucose fluctuations. The classical non-diabetic endocrine emergencies comprise thyroid storm, myxoedema coma, acute adrenal crisis, and phaeochromocytoma. They all pose diagnostic and therapeutic challenges and require specific treatment such as endocrine replacement or blockage therapy, apart from supportive care and treatment of the inciting event. It is important to note that such conditions are occasionally the first manifestation of an endocrine disorder. This chapter also briefly discusses amiodarone-induced thyroid dysfunction.