If the nose always appears to have a runny nose and a very high amount of phlegm in the throat, the main consideration is the presence of infections of the upper respiratory tract and inflammation of the trachea and bronchi. There are different degrees of inflammatory reactions in the airways, and each person has different immunity and different types of infected pathogens. At this time of the year, mainly due to cold, rain, staying up late and other triggering factors that reduce immunity, the nasal cavity, pharynx and tracheal mucosa will have different degrees of congestion and edema, as well as the exudation of large amounts of inflammatory secretions. It is possible that the infection by viruses, bacteria, mycoplasma, chlamydia, rickettsia and other pathogens may lead to a relatively strong inflammatory reaction in the airways, so there will be symptoms of nasal cavity always with nasal mucus and phlegm in the throat.