Snuffing up water into the nose and then expelling it has many medical benefits, the most important of which is that it removes accumulated secretions from the nasal cavity, as well as dust that adheres to the mucus lining of the nose, such as house dust, pollen, and the airborne spores of some funguses and moulds. It moistens the inside of the nose so as to keep the mucus lining in good condition, and removes microorganisms that cling to the inside of the nasal cavity.
Studies that were carried out to find out the effect of Wudhoo' on nasal health have proved that the noses of those who do not pray are inhabited by huge numbers of streptococcus and staphylococcus germs as well as other bacteria, whereas the noses of those who regularly performed Wudhoo' do not contain any colonies of germs, although in a few cases there were small numbers of germs, which soon disappeared after they were taught how to rinse the nose properly.
Hence the Prophet, peace and blessings of Allah be upon him, advised against going to extremes in rinsing the nose and repeating it three times, so as to get rid of all the microorganisms present in this vital and important place, because it is the entrance to the respiratory system.
(from Islamic Medicine: The Key to a Better Life by Yusuf Al-Hajj Ahmad, Published by Darussalam)
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