Was "Going outside with wet hair will give you a cold" taught in school?

Yes — and not as a joke question on a quiz. This health claim showed up in textbooks, worksheets, and classroom posters through the 1970s, which is why so many people still remember it as settled fact long after the science moved on.

When was this understanding updated?

The evidence had largely shifted by around 1985. Schools don't flip overnight, though — plenty of classrooms kept teaching the older version for years after researchers had already moved on.

Is "Going outside with wet hair will give you a cold" true?

Step outside in winter with wet hair and somebody's grandmother will predict a cold within the week, no exceptions allowed. The warning assumes being chilled triggers illness all on its own, no pathogen required. Colds actually need an actual virus, wet hair or dry; cold weather just keeps people indoors together, swapping germs in closer quarters than usual. Correlation did a lot of heavy lifting in a claim that never needed one.

What you were taught

Going outside with wet hair will give you a cold

What we know now

Colds are caused by viruses, not by being chilled or having damp hair. Cold weather may keep people indoors together, but infection still requires exposure to a pathogen.

Updated understanding emerged around 1985

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Common questions

Was "Going outside with wet hair will give you a cold" taught in school?: Yes — and not as a joke question on a quiz. This health claim showed up in textbooks, worksheets, and classroom posters through the 1970s, which is why so many people still remember it as settled fact long after the science moved on.
Is "Going outside with wet hair will give you a cold" true?: No. Colds are caused by viruses, not by being chilled or having damp hair. Cold weather may keep people indoors together, but infection still requires exposure to a pathogen. If you want the primary citation, start with Mayo Clinic - Common Cold Causes.
When was this understanding updated?: The evidence had largely shifted by around 1985. Schools don't flip overnight, though — plenty of classrooms kept teaching the older version for years after researchers had already moved on.

Is "Going outside with wet hair will give you a cold" true?

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