Obviously, diseases like the cold and flu are cause by viruses, so weather alone wouldn’t cause it. So why do we get runny nose, sneezing, and other symptoms when we go out in the cold without a jacket?
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Cold air can lower your immune system. A virus you were exposed to but would have fought off and not noticed in warm weather, can make you sick in the cold when your immune system is less active. Lack of sunlight in the winter months in general can also lower your immune system response.
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