Children always have sticky phlegm in the throat, may be related to nasal diseases, pharyngeal diseases, respiratory diseases and other reasons. 1. Nasal diseases: such as sinusitis, due to the stimulating effect of inflammatory factors, can cause an increase in nasal secretions, secretions can flow into the throat, manifested in the throat is always sticky phlegm. 2. Pharyngeal diseases: such as chronic pharyngitis, chronic tonsillitis, due to the pharyngeal mucosa, submucosa and lymphatic tissue inflammatory reaction, there is always sticky phlegm in the throat phenomenon. 3. Respiratory diseases: such as bronchiectasis, due to infection, immune response and other causes of irreversible bronchial expansion, deformation, can appear in the throat always have mucus phlegm. Parents are advised to take their children to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.