Sinusitis nose ventilation with snot backflow to the throat, it is possible that the nasal cavity is caused by excessive secretion collection, is a manifestation of sinusitis. The nasal cavity can backflow back into the throat from the local anatomy, is due to the nasal cavity around the skull within the cavity structure, called the sinuses, including the maxillary sinuses, frontal sinuses, the internal pterygoid sinuses and sieve sinuses. Among them, the frontal sinuses, the anterior group of sieve sinuses and the opening of the maxillary sinuses are located in the front center of the nasal cavity, i.e., the middle nasal passages, and the posterior group of sieve sinuses and the opening of the pterygoid sinuses are located in the posterior part of the nasal cavity. As a result, nasal snot will flow from the nasopharynx into the pharynx under the swing of the cilia on the surface of the nasal mucosa, or excessive secretion due to gravity. Sinusitis patients should not ignore the condition if the phenomenon of backflow of nasal mucus occurs, and should seek medical attention in time, so as not to cause nasopharyngitis and other nasopharyngitis caused by the backflow of nasal mucus.