Mucosal cyst of maxillary sinus mostly refers to maxillary sinus mucosal cyst, generally considered to be the sinus mouth obstruction or inflammatory factors, the specific situation is analyzed as follows: 1. Sinus obstruction: when the mucous glands or plasma glands of the sinus mucosa are blocked, the gland secretion swells, then the maxillary sinus mucosal cysts can be formed. 2. Inflammation: mostly seen in patients with rhinitis or sinusitis, and the local mucosa is stimulated by inflammatory factors causing mucosal swelling. If patients do not have clinical symptoms, generally do not need special treatment. Usually pay attention to keep the nasal cavity clean and dry, wear a mask when going out. But if it is caused by inflammation, you need to consult a doctor in time to clarify the cause of the cause of treatment.