High fever generally refers to a body temperature of 39.1℃-40℃. There are many causes of high fever in the elderly, such as infections, neurological diseases, tumors, etc. can cause high fever, so high fever in the elderly is not necessarily a precursor to death, but some elderly people may have high fever before they die, and because of the poor resistance of the elderly body to diseases, high fever in the elderly may cause death. Common causes of high fever in the elderly are infectious diseases, such as infections of the respiratory tract, urinary tract, gastrointestinal tract, skin, brain and other parts of the body can cause high fever, which is usually accompanied by corresponding symptoms, such as coughing, coughing up sputum, difficulty in breathing, diarrhea, vomiting, skin abscess, severe pain in the brain, etc., mostly caused by pathogens stimulating the brain and affecting the thermoregulatory center. Severe infections may also cause sepsis, a condition of infectious toxic shock, which may result in death. In addition, elderly people with brain diseases may suffer from dysfunction of the central thermoregulatory system during an attack, which may manifest as a high and uncontrollable fever. Elderly people with malignant tumors may also develop high fever when their disease is advanced, which may be related to tumor cell necrosis, radiotherapy damage to the body, co-infection, etc., and accompanied by cachexia. However, the high fever caused by such cases may not be cooled down by general antipyretic measures, so it is necessary to seek medical treatment for the original disease in time. Therefore, a high fever in the elderly is not necessarily a precursor to death, and when the elderly are dying, they may sometimes exhibit hypothermia due to the serious destruction of the functions of the body systems and the failure of multiple organs. Therefore, if an elderly person has a high fever, he or she should actively seek medical treatment and should not be treated as a precursor to death to avoid delaying the treatment.