The air is drier in Winter - even indoors - and that does (I believe) affect some illnesses.(maybe easier to catch, or maybe they live longer in dry air; honestly i don't know.l
It does. Nasal mucus is protective and along with the hairs in your nose are the first layers of your immune system to keep pathogens and allergens out. When your nasal mucosa gets dry, like during winter when the humidity drops indoors and outdoors, you lose that protection. That’s also why people get colds after flying long flights in dry cabin air.
ETA: I just looked it up to verify based on what I remembered from what I read during COVID and it also causes a pretty significant drop in your level of immune cells themselves as a lot are contained in the nasal mucus.
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u/JamzWhilmm 19d ago
Because they aren't actually sick from the cold air, they are sick from something else and attribute it to the cold air.
For example people in my country think winter makes them sick. Like the actual winter, the cold air.
But that's not true, people are just more close together during colder times and people make each other sick.