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Why do my eyes tear up in the cold?

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Q: Every time I go outside in cold weather, my eyes tear a lot. What causes it, and can I stop it? - Andy K., Chicago A: Tearing up in cold weather is common and can be triggered by a number of things. The No. 1 trigger is dry eyes, since cold wind increases evaporation of moisture from the top layer of your cornea, exaggerating problems with dryness you may have already. When that...