The sudden chilling and shivering of the elderly may be a sign before the fever, which is commonly associated with viral or bacterial infections, such as respiratory infections, urinary tract infections, abdominal infections, sepsis, and so on. Fever is the process of increasing body temperature, when the central thermoregulatory site is elevated, the body temperature does not reach this level, in order to increase heat production, the body will be shivering by way of chills and shivering, increase heat production, so in the early stage of the rise in body temperature there will be chills and chills performance. And fever for the elderly is most commonly associated with infectious diseases, such as pneumonia, acute bronchitis, acute gastroenteritis, acute cystitis, acute pyelonephritis, sepsis and so on. To determine the cause of the disease, we need to go to the hospital to improve the blood test, if necessary, with CT, ultrasound and other tests to determine the diagnosis, we need to apply the appropriate medication for the pathogen, and the high temperature requires medication to reduce fever, such as aminophenol, acetaminophen and so on.