There are four groups of paranasal sinuses: frontal sinus, septal sinus, maxillary sinus and pterygoid sinus. Because the openings of each group of sinuses are close to each other, inflammation of one sinus can involve other sinuses, and sometimes several sinuses can be combined to form multiple sinusitis or total sinusitis. The incidence of sinusitis varies from sinus to sinus and from sinus to sinus. The highest incidence of maxillary sinusitis is due to the largest sinus cavity, low sinus floor and high sinus opening, which makes it easy to accumulate pus once the septic drainage is poor. The septal sinus has a different size and is shaped like a honeycomb, which is not conducive to drainage: because the maxillary sinus and septal sinus are the earliest to develop, they can be affected during childhood, so the incidence of septal sinus is also higher, followed by frontal sinusitis, and pterygoid sinusitis, which has a low diagnostic rate due to its deep location, and now there is CT screening to improve the diagnostic rate. It is called “nasal abyss” in Chinese medicine. The new disease of nasal congestion, cloudy mucus, headache, fever and loss of sense of smell is called “acute nasal abyss”. The causes of sinusitis: 1, fatigue, cold, malnutrition, excessive smoking and alcohol, resulting in lower immunity, can cause sinusitis; 2, nasal cavity diseases: such as nasal septal deviation, nasal cavity allergic disease, nasal cavity tumors, nasal cavity foreign body, sieve bubble too large to affect the sinus drainage; 3, tonsillitis and adenoid hypertrophy, resulting in nasal congestion, poor drainage; 4, after nasal surgery, epistaxis nasal filling caused by sinusitis; 5, adjacent Organ lesions, such as the upper row of teeth root inflammation caused by; 6, swimming, air pressure changes caused by.