Can pneumonia recur? It should be decided based on an individual's constitution. If one has normal immunity and a good constitution, generally, it will not recur after recovery. If one is frail or has low immunity, there is also a certain chance of recurrence clinically. Therefore, it is important to timely adjust the constitution and enhance immunity. One should drink more water, quit smoking and alcohol, avoid exposure to smoke, dust, second-hand smoke, and irritating chemicals, and do more aerobic and endurance exercises. This can help improve the body's immune capabilities and aid in disease recovery.