Because of the high number of underlying diseases in the elderly, geriatric pneumonia can easily lead to severe pneumonia in severe cases. If pneumonia in the elderly develops into severe pneumonia, the mortality rate is high and the prognosis is poor. Most pneumonia in the elderly is insidious, difficult to detect and easy to miss. Therefore, when pneumonia is contracted in the elderly, it should be detected promptly, evaluated correctly, treated promptly, and given respiratory support or nutritional support depending on the extent of the disease. Therefore, prevention of pneumonia in the elderly should be done to avoid making pneumonia in the elderly develop into severe pneumonia.