There is always phlegm in the throat is a symptom that may be induced by the following diseases: 1, chronic pharyngitis, clinically more common may be due to the posterior pharyngeal wall, the root of the tongue lymphatic follicle hyperplasia formed by secretions, clinical patients may also have a dry throat, pharyngeal foreign body sensation and other historical manifestations; 2, allergic pharyngitis, patients may be the formation of local metamorphosis of the throat, patients accompanied by pharyngeal itching, cough and other clinical manifestations The patient has a history of leukotriene receptor antagonist drug therapy, and many patients have an effect on the treatment; 3, reflux pharyngitis, long-term gastroesophageal reflux caused by gastric juice into the throat to form phlegm, but also the formation of pharyngitis secretions; 4, chronic bronchitis, lung infection and other medical history of long-term phlegm in the throat, the patient is usually accompanied by cough, phlegm only after coughing; 5, post-group sinusitis, long-term phlegm formed by the backflow of nasal mucus into the throat.