Cold response: Your nose functions to warm the air you breath before it reaches the lungs. When the air is colder, the nasal vessels become dilated to improve your ability to do this. That also tends to send other fluids into the soft tissues of the nose, leading to increased secretion, runniness. With dilated superficial blood vessels and the trauma of blowing, you get epistaxis, a fancy word for a bloody nose!
Answered 6/10/2015
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