Ninety-something years old body temperature is normal feel body fever, consider may be endocrine abnormality, autonomic nervous system dysfunction, immunocompromise and so on. 1. Endocrine abnormality feeling body fever: hyperthyroidism, diabetes, adrenal function abnormality and other causes of hypermetabolism, can feel body fever, but the body temperature is normal. The use of drugs can be rationalized after a clear diagnosis. For hyperthyroidism, propylthiouracil and methimazole are used. For diabetes, metformin and insulin are used. For hyperadrenalism, oral bichlorophenyl dichloroethane can be used. 2. Fever caused by autonomic dysfunction: autonomic dysfunction can lead to panic, palpitation, chest tightness, hand tremor, cold and hot, sweating abnormally. Oral vitamins, methylcobalamin, vitamin B and other drugs can be used to regulate. 3. Fever caused by low immune function: the elderly body weakness, poor digestion, dietary stimulation, poor sleep, etc. may cause body heat. Fever with normal body temperature is a manifestation of low immune function, and body temperature fails to respond normally. It can be used appropriately to promote digestion and ensure sleep. You can use thymus peptide, gammaglobulin and so on to enhance the resistance. Elderly people with normal body temperature feel feverish, need to actively go to the hospital to check the body. Do not blindly use drugs, follow the doctor’s instructions for treatment.