Cold, dry air irritates your nasal lining, and as a result, your nasal glands produce excess mucus to keep the lining moist. That can cause those big, heavy drops that drip from your nostrils. Wearing a scarf in cold weather can help, because the air warms before it hits your nose. A runny nose is one of the most typical symptoms of the common cold. This shows the nose is very effective at making sure the air we breath becomes warm and wet before it reaches the lungs.
So how does it do this? Cold, dry air stimulates the nerves inside your nose, which send a message through your nerves to your brain. Your brain then responds to this impulse by increasing the blood flow to the nose, and these dilated blood vessels warm the air passing over them. Secondly, the nose is triggered to produce more secretions via the mucous glands in order to provide the moisture to humidify the air coming through.
These cells trigger the production of more liquid in your nose to make the air more moist. Heat and water loss are closely related: heating the air in the nasal cavities means the lining of the nasal cavity mucosa becomes cooler than core body temperature; at the same time, water evaporates becomes vapour to make the air moist.
In other words, it can still transmit disease to others. You already know that frequently washing your hands is a great way to avoid getting sick, but Lee is emphatic about it: Touching your nose, mouth, or eyes without washing your hands can mean that disease-causing bacteria and viruses can infect or re-infect you more easily.
Blowing your nose too hard can damage the delicate cilia. It can even propel pathogens deeper into the nasal cavity, where they can further infect the body. Lee suggests treating a stuffed or runny nose by moistening the nasal lining with saline solution through nasal sprays or irrigation tools like neti pots. This will help loosen the mucus and help bring it back to normal more quickly. You can also use a nasal decongestant drug.
Other causes include hormonal changes, RSV, and spicy foods. Learn about some of the causes and treatment options for common this symptom. Health Conditions Discover Plan Connect. Medically reviewed by J. How to stop Takeaway You can get a runny nose rhinorrhea for a lot of reasons. Why does my nose run when I cry? Why does my nose run when I eat?
Why does my nose run when I have a cold? Why does my nose run when I wake up in the morning? Does a runny nose clear my sinuses? How can I stop my nose from running? Read this next. How to Stop a Runny Nose at Home. Medically reviewed by Alana Biggers, M. Medically reviewed by Elaine K.
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