Although acute upper respiratory tract infection in children is a common disease, if it is not treated in time, inflammation will easily involve other organs and cause complications. The common diseases are acute suppurative otitis media, cervical lymphadenitis, sinusitis and abscess of posterior pharyngeal wall. The downward spread of inflammation involves the lower respiratory tract, which can cause trachea, bronchitis and even pneumonia.

It is worth noting that the early symptoms of some diseases, such as measles, whooping cough and epidemic cerebrospinal meningitis, can also be manifested as colds. Therefore, in the diagnosis, besides the clinical symptoms, it is necessary to comprehensively analyze the local epidemic history, physical examination and laboratory data, and sometimes it is necessary to observe the development of the disease to determine the diagnosis.