title: Extreme pyrexia.
mesh_terms: D001833:Body Temperature Regulation; D005334:Fever / Q000209:etiology / Q000503:physiopathology* / Q000628:therapy; D006359:Heat Exhaustion / Q000150:complications / Q000503:physiopathology; D006801:Humans; D007027:Hypothalamic Diseases / Q000150:complications / Q000503:physiopathology; D007239:Infections / Q000150:complications / Q000503:physiopathology; D010673:Pheochromocytoma / Q000150:complications / Q000503:physiopathology; D005082:Physical Exertion; D013958:Thyroid Crisis / Q000150:complications