DEAR DOCTOR K: Why does my nose run in cold weather? Does it mean I'm getting a cold?
DEAR READER: Cold air is not only cold, but also dry. The lungs are built to deal with air that is warm and moist. So, a main function of your nose is to make the air you breathe in warm and moist. Bones in the nose (called turbinates) are covered with blood-filled membranes. The blood running through the turbinates is at body temperature: around 98.7 degrees F. The heat in the blood warms the cold air you breathe in.