The work carried out made it possible to substantiate the need to apply a method for studying the frequency of beating of cilia of the mucous membrane of the nasal cavity and paranasal sinuses in patients with chronic rhinosinusitis when choosing treatment tactics in an ENT hospital. Analysis of the study of data on the functional and morphological state of the mucous membrane of the nasal cavity and maxillary sinus allows us to judge the severity of the pathological process before surgery, which is the fundamental factor in the algorithm for the treatment of chronic rhinosinusitis.