Why Your Nose Gets So Dry in Winter, and What Actually Helps

Every breath you take passes over a surprisingly hard-working surface. The lining of your nose warms incoming air toward body temperature and adds moisture to it before it reaches your lungs. In summer that is easy. In January, when the air outside is freezing and the air inside has been baked dry by a furnace or radiator, the lining gives up more water than it can replace.

The result is the familiar winter nose: tight, itchy, crusty in the morning, and occasionally bloody when you blow it.

What dry air does to the inside of your nose

The front of the nasal passage, just inside the nostril, takes the brunt of it. This area is covered by a thin layer of moist tissue with a dense network of small blood vessels close to the surface. When that tissue dries out it loses flexibility, small cracks form, and crusts build up. Picking or forceful blowing then breaks the tiny vessels underneath.

Cold air is part of the problem even before heating comes in. Cold air simply cannot hold much water, so even if outdoor relative humidity looks high on a weather app, the actual amount of moisture in the air is low. Warm that air up indoors and its relative humidity drops sharply.

What the studies show about winter and nosebleeds

Researchers have looked at this by matching emergency room visits for nosebleeds (epistaxis) against local weather.

• In Saint John, New Brunswick, a review of 476 emergency cases found the highest number of nosebleeds in winter, and visits rose as mean daily humidity fell.
• In Alberta, a larger review of 4,315 patients found that colder months and colder days were linked to more nosebleed visits. Humidity alone did not show a clear link there, which researchers think may reflect how dry Alberta's air is year-round.

A large Stanford analysis of more than 180,000 children went further and found that the effect of humidity depends on climate zone. The overall pattern holds, though: winter is when noses tend to suffer most.

Habits that help with everyday dryness

None of these are complicated, and most people do best with a combination.

Add moisture where you sleep. A cool-mist humidifier in the bedroom matters more than one in the living room, because you spend seven or eight hours breathing that air. Aim for roughly 40 to 50 percent relative humidity and clean the tank often.

Drink enough water. Hydration will not fix a dry nose by itself, but being dehydrated makes the lining dry faster.

Be gentle. Blow softly, one nostril at a time. Trim fingernails if picking at crusts is a habit, especially for kids.

Moisturize the lining directly. Saline sprays rinse and briefly wet the nose. Oil-based moisturizers stay longer. In a randomized crossover trial in northern Sweden during a dry spring, 79 people with nasal dryness used pure sesame oil for two weeks and saline for two weeks. Dryness, stuffiness and crusting all improved more with the oil, and 8 in 10 participants said their symptoms got better with it, compared with 3 in 10 with saline.

When dryness is a sign of something else

Dryness that comes and goes with the season is common. Talk to a doctor if you notice any of these:

• A nosebleed that keeps going after 20 minutes of steady pressure on the soft part of the nose
• Nosebleeds that happen often, especially from the same side
• Bleeding after a blow to the face or head
• Dryness alongside blocked breathing on one side, facial pain, or a change in your sense of smell
• Nosebleeds while taking blood thinners

Some medicines, including antihistamines, decongestant sprays used for more than a few days, and certain acne and blood-pressure drugs, can also dry out the nose. A pharmacist can tell you whether something you take is likely to.