Does Going Outside in the Cold Really Make You Catch a Cold?

This episode debunks the long-held belief that cold weather causes colds. In reality, colds are caused by viruses, not by temperature, wind, rain, or wet hair. Without exposure to a virus, cold air alone cannot make someone sick.

The myth persists because colds are more common in winter, leading people to confuse correlation with causation. During colder months, people spend more time indoors in poorly ventilated spaces, which allows viruses to spread more easily. Dry winter air can also weaken the nose and throat’s natural defenses, making infection slightly more likely once a virus is present — but it does not cause illness by itself.

Warnings like “don’t go out with wet hair” became popular because symptoms appear days after infection, making it easy to wrongly blame recent exposure to cold. The belief also survived because it offers a comforting sense of control and is reinforced by language itself — we call it a cold, after all.

The truth is clear: you don’t catch colds from cold weather — you catch them from people. Cold may affect comfort, but viruses are the real cause.