Upper respiratory tract infection into pneumonia is possible, this situation is mainly common in the resistance is relatively poor patients, and even have chronic underlying diseases, such as diabetes, as well as bronchodilatation, chronic bronchitis and so on. Generally, the resistance of patients is relatively poor, and it is easy to be infected by viruses and bacteria after being cold or drenched in rain, so that the mucous membrane of the upper respiratory tract becomes congested, edematous, and the inflammatory secretion oozes out. As the inflammation becomes more and more obvious, the secretion in the airway increases, and the pathogens in the airway will multiply more and more, which will gradually spread to the lower respiratory tract, and cause the inflammatory reaction of the alveolar mucosa and thus turn into pneumonia, which is one of the most serious complications of upper respiratory tract infection.