It depends on the size of the lung infection, whether the pathogenic microorganism causing the lung infection is sensitive to the available drugs, and whether the elderly person has a strong resistance. If the area of the lung infection is large and the pathogenic microorganism causing the lung infection is resistant to drugs, coupled with the poor resistance of the elderly, the situation is more dangerous and there is a possibility that the lung infection will gradually worsen and even cause death. If the area of lung infection in the elderly is not large and the resistance of the elderly is still okay, plus the pathogenic microorganisms causing lung infection in the elderly are sensitive to the existing drugs, in this case, the lung infection can be cured. At the same time, during the treatment, attention should be paid to making the elderly take rest, drink more water, with special emphasis on drinking small amounts of water several times, and pay attention to the diet by eating well-digested and nutritious food.