The place where the nose leads to the mouth is medically called the nasopharynx. The pharynx is the common channel of the digestive and respiratory tracts, located in the cavity above the esophagus after the mouth and nasal cavity, and is wide at the top and narrow at the bottom, as if it were a funnel. The pharynx is divided into three parts, nasopharynx, oropharynx and laryngopharynx. Nasopharynx is located after the nasal cavity, above the soft palate, forward through the posterior nasal aperture and nasal cavity, down through the oropharynx. When suffering from rhinitis or sinusitis, the secretions in the nasal cavity will flow backward to the nasopharynx, stimulating the pharynx to produce coughing symptoms, and then coughed up through the oral cavity. Rhinitis, sinusitis, if the treatment is not timely, turned into a chronic disease, by the nasal secretions of long-term inflammatory stimulation, will also trigger pharyngitis.