When you have a cold, your body produces extra mucus to help fight off the infection. This mucus can sometimes accumulate in the nasal passages and sinuses, causing pressure and irritation. Your eyes may water in response to this irritation, as a way to flush out the irritants and reduce the discomfort.
In addition, the inflammation and swelling caused by a cold can also block the drainage channels in your eyes, leading to an excess of tears. This can cause your eyes to water more than usual, even if you are not experiencing any irritation. Overall, watering eyes are a common symptom of a cold, and they usually go away once the infection has cleared.
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