The nose has important physiological functions for the human body. The main physiological functions of the nose are respiratory function and olfactory function, in addition, the nasal cavity and sinuses also have a resonant effect on vocalization, and tears can be excreted into the nasal cavity through the nasolacrimal ducts, and the nasal cavity also has various reflexes, such as sneeze reflex, etc. The nasal cavity is the first channel for gas to enter the body. If this channel is blocked, gas cannot enter the alveoli of the lower respiratory tract through the nasal cavity to exchange oxygen and carbon dioxide with the red blood cells in the body, and the nasal mucosa has the role of heating and humidifying the air inhaled from the outside world to meet the physiological requirements of the human body. If the nasal cavity is blocked and the air is inhaled from the mouth, the dry and cold air will directly enter the lower respiratory tract, which will affect the respiratory and circulatory functions and even cause various pathologies. The olfactory cells in the mucous membrane of the olfactory area of the nasal cavity and the olfactory nerves at all levels can sense the inhaled odor and produce the sense of smell.