The three main functions of nasal hairs are: first, nasal hairs can block the airborne dust, viruses, bacteria, etc. from invading the nasal cavity, and the cilia of nasal hairs can push some of the bacteria, etc. adhering to the surface of the nasal cavity into the stomach and intestines, and use the action of digestive enzymes to kill them. Secondly, the nasal hairs can maintain the temperature of the nasal cavity, and when the patient inhales too cold air, the nasal hairs can warm up the air, and the patient will not feel any obvious discomfort. For patients with dry rhinitis and atrophic rhinitis, nasal hairs also have a certain moisturizing function. Thirdly, nasal hairs can protect the olfactory nerve in the nasal cavity from damage. When outside world such as flying insects, mosquitoes or other things enter the nasal cavity, nasal hairs can play a certain obstructive and blocking role. All in all, nasal hairs have a lot of uses for patients, so patients should remember not to pluck nasal hairs casually.