this post was submitted on 07 Jul 2023
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We have a similar one here in the US. People think if you go outside when it's too cold, you'll get sick.
It's not completely baseless. You can't get sick from the cold itself, but lower core body temp does weaken your immune system until you warm up, making it easier for you to get sick if you do get exposed to something.
The cold, dry air during the winter can also dry out the mucus membranes in the sinuses which can make it easier for pathogens to enter the body. Again, doesn't make you sick directly but does interfere with your body's defense mechanisms.
In the US, I hear this more when your hair is wet: "Don't go outside, it's cold and your hair's wet, you'll get sick!"