Five-year-old children often have phlegm in the throat, may be the manifestation of certain diseases, such as chronic bronchitis, chronic rhinitis, etc., should be timely consultation to identify the cause of the disease. 1. Chronic bronchitis: the course of the disease is long, repeated acute episodes, gradual aggravation; the main symptoms of chronic cough, cough sputum (sputum is usually white mucus or plasma foamy, combined with the infection of sputum into a mucopurulent or yellow pus sputum), some patients may have wheezing. 2. Chronic rhinitis: Due to the swelling of the mucous membrane in the nasal cavity, the mast cells on the surface of the nasal mucous membrane secrete more secretions, which leads to the backflow of nasal mucus causing more sputum. Five-year-old children often have phlegm in the throat, but also do not rule out other factors, it is recommended that parents should take the child to the doctor in a timely manner, ask the doctor to clarify the cause, give targeted treatment.