Nasopharyngeal phlegm foreign body coughing out swallowing reasons are: nasal diseases, chronic pharyngitis and so on. 1. Nasal diseases: such as rhinitis, sinusitis, nasal polyps and other nasal diseases, resulting in increased mucus secretion of the nasal mucosa, a large amount of snot backflow, flow to the nasopharynx, resulting in the feeling of nasopharyngeal foreign body coughing out swallowing, the patient often coughing or swallowing action. 2. Chronic pharyngitis: due to the nasal cavity disease snot increase occurs backflow, containing inflammatory factors of the snot stimulation of the pharynx, resulting in pharyngeal inflammatory reaction, pharyngeal mucosal secretions increased and more viscous, resulting in nasopharyngeal foreign body sensation, coughing out swallowing, shouting will be accompanied by pharyngeal dryness, pharyngeal itchy situation. Nasopharyngeal phlegm foreign body sensation coughing out swallowing symptoms, to go to the hospital, to identify the cause of the appropriate treatment.