Blowing your nose is an act that we take for granted, but I’m afraid not many of us can do it correctly. Blowing your nose has its own rules, and if you do it improperly, you will not only behave indecently, but your eyes and ears may also be harmed! I. The truth about nasal snot Under normal circumstances, the mucous membrane of the human nasal cavity secretes mucus at all times, totaling about 1,000 mL. 700 mL of it evaporates to moisten the air in the nasal cavity; the other 300 mL is gathered on the surface of the mucous membrane, forming a thin layer of “mucus blanket” to moisten the nasal cavity membrane to prevent it from drying out and making it moist. Inhaled air, and sticky by the air inhaled dust, pollen, microorganisms, etc., so that they do not stimulate the respiratory tract or cause infection. The mucus also contains lysozyme, which has the ability to inhibit and dissolve bacteria. Second, blowing your nose is a normal reaction Why don’t you usually feel it, but once you get a cold or rhinitis occurs, you can feel the snot? Because when you have a cold or allergy, the mucous membrane of the nose is stimulated, edema occurs, secretion increases, and the normal channels for discharging nasal snot are not enough, so you will feel your nose is blocked and there is a lot of nasal snot, and you have to blow it out to be comfortable. Third, cold and flu will cause runny nose which is already known. But why do some people often have runny nose even after they get well from a cold? Runny nose when you have a cold is called acute rhinitis, when the mucous membrane of the nasal cavity is congested and swollen, and the secretion of glands increases to form nasal mucus. At first, it is clear water-like, and after 3 to 5 days, it gradually becomes pus-like, and it can be cured after 1 to 2 weeks. If acute rhinitis recurs, the nasal mucosa is congested and swollen for a long time or even hypertrophic, that is, chronic rhinitis, and it will often runny nose. Blowing the nose is one of the normal physiological response mechanisms of the human body, just like sneezing, to expel harmful substances from the nose from the body. Some people, especially children, take paper or a handkerchief in their hands when blowing their nose and use their hands to pinch both nostrils at the same time and blow hard. The ears will buzz, and sometimes even feel pain. The reason for the above situation is that when people blow their nose, they rely on strong exhalation force to drive out the snot, and because the front nostril is small and the back nostril is large, when they blow their nose with excessive force and pinch both nostrils, all the snot cannot flow out from the smaller front nostril, but gushes from the nasopharynx to each sinus cavity and through the eustachian tube to the middle ear cavity, and enters the eustachian tube and makes it blocked, and at this time the stuffiness and swelling of the ear can occur. This can lead to a feeling of stuffiness in the ear, inaudibility and tinnitus. Due to the large amount of bacteria in the nasal discharge, bacterial infection can cause otitis media or sinusitis. Fourth, the correct way to blow your nose Use your fingers to press one side of the nostril, use the other side to blow the snot outward, and then use the same method to blow the other side, you can also put paper or a handkerchief under the nostril, put both hands lightly on both sides of the nose, and blow the snot out with a little force. Sometimes the chin can be lifted upward and the snot can be discharged from the posterior nostril through nose suction and then cackled out through the nasopharynx. However, it should be noted that no matter what method of blowing the nose, you should not use excessive force.