The basic metabolic rate of the elderly is lower than that of young people, so they are more afraid of cold and wear thicker clothes than young people, which is a normal phenomenon. Secondly, infectious disease, can appear cold, chills, chills, high fever, it is recommended to check the blood routine to see if the white blood cells are high, and then a chest CT and whole abdomen ultrasound, urine routine to find the primary site of infection, anti-inflammatory treatment can be carried out.