If you hold your nostrils tightly closed between your fingers, shut your mouth tightly and blow out your cheeks, you will hear a click of increased air pressure in the middle ear from the force of the blowing.
However, don't make a routine practice of this experiment, because blowing air forcefully into the Eustachian tube may hurt the drum, and also force secretions from the throat into the tube and middle ear, and thus spread infection.
When blowing the nose for the purpose of clearing it, hold the paper tissue against both nostrils without compressing them, then blow, and no secretion or forced air currents will enter the Eustachian tube.
The accepted way of blowing the nose used to be: to compress one nostril while clearing the other; but nose specialists now advise the first method as the safer one.
In cases of colds in the head and sore throats, the Eustachian tube becomes swollen and closed up, so that no air can pass to the middle ear; this causes retraction of the eardrum inward.
Inflammation of the opening of the Eustachian tube and retraction of the eardrum produce temporary deafness and pain in the ear, although the ear itself is not really inflamed.
A few drops of Glucophedrin (watery solution) dropped in one nostril while lying flat on the back, immediately turning the head well toward that side for two minutes, and repeating this process with the other nostril, turning to the corresponding side for two minutes, will promptly dilate the opening of the Eustachian tube and relieve the pain and deafness.
If a cold or sore throat is neglected, with continued exposure to cold and lack of treatment, the inflammation in the opening of the tube will extend the whole length of the tube, into the ear and eardrum.
In this case Sulfa or Penicillin should be taken, else the infection will cause rupture of the drum or the drum will have to be lanced in order to free the accumulation of pus.
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