The prognosis of pulmonary infection in the elderly is divided into three cases: 1, the basic state of the elderly is very good, there is no underlying disease, usually life can also take care of themselves, this situation even if there is a lung infection, go to the hospital doctor to give advice, give regular treatment, there is no prognosis, this patient is certainly well. 2, the patient’s respiratory function is very poor, and there is heart, liver, kidney and other important organ function reserve is reduced, and also The hospital only needs to control the symptoms, the patient does not appear cough, cough, fever, it is recommended that the patient is discharged, this patient also does not have the risk of death. 3, the patient has serious complications, there is liver, kidney, heart and brain and other organ insufficiency, combined with pneumonia, the infection is not easy to control, especially the emergence of drug-resistant bacteria, the patient’s lung infection is recurrent, even during hospitalization, the condition is aggravated, life-threatening. This is one of the direct death factors of elderly patients, and the mortality rate is reported to be as high as 1/3 at home and abroad.