Fever of 39℃ in the elderly is mostly related to germ infection, respiratory tract inflammation, and high inflammatory factors in the body, which can easily lead to persistent high fever. You can take acetaminophen extended-release tablets to reduce fever, together with cefaclor dispersible tablets, acyclic guanosine oral solution and busulfan anti-inflammatory oral solution to anti-infection treatment. If you are an inpatient, you must pay attention to good body care, usually scrub your body with warm water to keep your skin clean and prevent nosocomial infections. If the elderly suffer from hypertension, diabetes and other cardiovascular diseases, they must use the medication under the guidance of a doctor to avoid other adverse reactions. The elderly are also prone to constipation, so they should pay attention to keep their bowels flowing smoothly, eat more green vegetables and fruits, supplement dietary fiber, and drink more honey water to promote smooth stools and prevent the accumulation of toxins in their bodies. In addition, pay attention to try to be more active, improve their resistance, do not stay in bed for a long time, and eat more nutritious food, such as eggs, milk and walnut powder, to replenish the body’s energy and fight the disease.