The nose is pinched and puffed to make the ears breathe, usually with the mouth closed, so that the nasal cavity and the oral cavity form a closed cavity and the gas enters the middle ear by puffing. Because the only outlet of the middle ear cavity is at the eustachian tube pharyngeal opening at the very back of the nasal cavity, it is through the eustachian tube that the vibrations are generated by maintaining atmospheric pressure inside and outside the eardrum. If there are no special symptoms, it is not allowed to do this action. It is easy to make the dirty things, especially during the cold and rhinitis period, to invade the middle ear cavity and cause middle ear inflammation, which may also lead to tympanic membrane perforation in serious cases. If you need to do this action, it is usually because the eustachian tube is functioning abnormally and causing the tympanic membrane to be trapped. You can do this maneuver after the symptoms appear, but you need to have good nasal ventilation before doing this maneuver, not be in the cold period, and have no pus nasal discharge before doing it under the guidance of a doctor.