Did you know? The middle ear is connected to the nasal cavity through the eustachian tube, which is usually closed so that nasopharyngeal secretions do not flow backwards into the ear. The eustachian tube is generally closed so that nasopharyngeal secretions do not flow back into the ear. People only open it temporarily when they yawn and swallow or when they blow their nose and drum hard. Blowing the nose badly can blow the nose back into the middle ear, causing inflammation of the middle ear and even perforation of the eardrum. So when blowing your nose, you should pay attention to the following: ① You cannot use your hands to pinch the nostrils and squeeze the snot out of the flattened nasal slit with great force, because when the pressure of blowing is greater than the pressure in the sinus or middle ear, the snot will go backwards into the sinus or middle ear. When blowing nasal snot, you should press your finger on one side of the nostril, and then blow the nostril in stages, the pressure should not be too high, and then blow the other side after blowing one side. ③If the nasal discharge is too sticky to blow out, you can put some ephedrine nasal drops that can constrict the blood vessels first, so that the nasal discharge can be easily blown out after the nasal passage is widened. ④The pressure when blowing the nose should not cause sudden ringing in the ear or sudden blockage as a principle.