If you have phlegm but not cough, consider that it is related to bronchitis, rhinitis, pneumonia and other diseases, you need to go to the hospital for further examination to clarify the cause of the disease, and then consult the doctor in a timely manner. 1. Bronchitis: generally due to the bronchial mucosa is stimulated by inflammatory mediators, congestion, edema, which in turn causes the phenomenon of phlegm without coughing, and there will be coughing, shortness of breath and other symptoms. 2. Rhinitis: usually due to the mucous membrane of the nasal cavity after being stimulated by inflammation, it will secrete a large amount of secretion, and it will flow backward into the throat, thus causing the phenomenon of phlegm without coughing, and rhinitis will usually appear nasal congestion, snot and other symptoms. 3. Pneumonia: may be due to the lung bronchial tube in the stimulation of pneumonia, the emergence of more secretions, thus causing the phenomenon of phlegm without coughing, pneumonia usually appear fever, cough and other symptoms. If the phenomenon of having phlegm without coughing occurs, you should go to the hospital in time to avoid delaying the condition, and in your daily life, you should have a reasonable diet and pay attention to rest.