Nasal reflux is also clinically known as postnasal drip syndrome, which refers to the chronic inflammation caused by metrorrhagia, or non-metrorrhagia, in the nasal cavity and sinuses. The secretion flows backward into the throat cavity through the nasal cavity, and chronic cough as well as the symptom of foreign body sensation occurs due to long-term stimulation, which may be caused by the blockage of the front end of the nasal cavity, or due to the inflammation of the nasal cavity close to the back end of the nasal cavity, and the inflammation directly enters the oral cavity. Therefore, the first thing to do is to treat the inflammation of the nasal cavity, you can consider spraying the nose medication cochlear or endocannabinoid, as well as rhinitis medication rhinitis capsule, with cetirizine hydrochloride treatment.