Having two or three years without a cold, that is, an upper respiratory infection, should be considered a very good sign at this time. This means that the immune function of the patient’s body is very strong, and he or she can have enough resistance to fight against the invasion of some external pathogens. Generally, the cardiopulmonary function and the immune status are so good that even in the presence of cold, rain, late nights, alcoholism, etc., which may lower the immune system, the patient is still able to resist the invasion of a variety of pathogens without having a significant cold. It is recommended that in the future, it is still necessary to pay attention to maintaining a proper and good state of sleep, balanced nutrition, as well as appropriate long-term physical exercise to enhance physical fitness, to be able to maintain this immune system in a particularly good state.