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Old 12-03-2015, 04:54 PM   #12 (permalink)
Mark Sandiego
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Join Date: Dec 2007
Posts: 70
The link between cold and colds is vasoconstriction of the vessels in the nose and respiratory tract. That is, the narrowing of blood vessels such as those in the nose, leads to dryness. This is even worse with air conditioning which replaces humid air with dry air. Without moisture our respiratory tract is limited in its ability to fight off infection.

With extreme cold comes mouth breathing which further limits the filtration that occurs in the nose. Additionally, when it's cold out we spend more time indoors which increases exposure to common surfaces and direct exposure to other people. Stay hydrated, stay rested, wash your hands often, don't touch your face (or at least use the back of your hand), and sneeze into your sleeve not your hands (or if you don't wear sleeves, use your arm?).
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