The three most common causes of nosebleeds are dry air, nose picking or rubbing, and physical trauma to the face. All three damage the same thing: the tiny, fragile blood vessels that sit just beneath the surface of the tissue lining your nose. These vessels exist to warm and moisten the air you breathe, but their position so close to the surface makes them remarkably easy to injure.
Dry Air
Dry air is the single most frequent trigger for nosebleeds, which is why they spike during cold weather months. The connection is straightforward: low humidity dries out the delicate membrane inside your nose, causing it to become crusty or cracked. Once that protective lining is compromised, the blood vessels underneath are exposed and fragile. Something as minor as a strong exhale or a sneeze can rupture them.
The problem gets worse indoors during winter. Home heating systems strip moisture from the air, so even when you come inside from the cold, your nasal lining keeps drying out. Nosebleeds are significantly more common in dry climates and during cold seasons for this reason. The ideal indoor humidity to protect your nasal passages is between 40 and 50 percent. A simple hygrometer (usually under $15) can tell you where your home stands, and a humidifier in the bedroom makes a noticeable difference for people who get recurrent nosebleeds in winter.
Keeping the inside of your nose moisturized also helps. Saline nasal sprays or saline gels won’t treat congestion, but they’re effective at preventing the dryness that leads to cracking and bleeding. A light application of petroleum jelly just inside the nostrils works the same way. If you’re prone to nosebleeds during dry months, daily moisturizing is the simplest preventive step you can take.
Nose Picking and Rubbing
The front of the nasal septum (the wall between your nostrils) contains a dense cluster of small blood vessels, all converging in one spot. This area is the source of the vast majority of nosebleeds. It’s also exactly where a fingertip lands when you pick or rub the inside of your nose.
Picking physically tears the lining, breaking open those shallow blood vessels. Even habitual rubbing from allergies or a cold can do enough damage over time. Children get nosebleeds more often than adults in large part because they pick their noses more frequently, and their nasal lining is thinner. The combination of dry air and nose picking is especially common: dryness creates an itchy, crusty feeling, which leads to picking, which breaks the already-weakened tissue.
Physical Trauma
A direct hit to the nose, whether from a fall, a sports collision, or any blunt impact, can rupture blood vessels immediately. This type of nosebleed tends to produce more blood than one caused by dryness or picking, because the force can damage larger vessels or a wider area of tissue. A broken nose almost always involves bleeding, but even a minor bump can be enough since the vessels sit so close to the surface.
Forceful nose blowing counts as a form of trauma too. When you blow hard to clear congestion, the pressure spike can tear the same fragile vessels that dryness weakens. If you’re congested, gentle blowing, one nostril at a time, is less likely to trigger bleeding.
Other Factors That Raise Your Risk
Beyond those top three causes, certain medications make nosebleeds more frequent and harder to stop. Blood thinners and antiplatelet drugs (like daily aspirin) both interfere with your body’s ability to form clots. Research from the Australian Journal of Otolaryngology found that people not taking these medications had an 80 percent success rate in stopping a nosebleed with standard first aid. For those on blood thinners or antiplatelets, that rate dropped to roughly 62 to 66 percent. People taking both types of medication together saw success fall to just 45 percent, and their nosebleeds recurred 27 percent of the time.
Antiplatelet medications disable platelet function for five to seven days, meaning even after you stop taking them, the increased bleeding risk lingers for about a week. If you take any of these medications and notice more frequent nosebleeds, that’s worth mentioning at your next appointment.
Allergies, upper respiratory infections, and frequent use of decongestant nasal sprays can also contribute. All of them inflame or dry out the nasal lining, creating the same vulnerability that cold, dry air does.
How to Stop a Nosebleed
Most nosebleeds look alarming but stop on their own with the right technique. Sit upright and lean slightly forward so blood doesn’t run down your throat. Gently blow your nose once to clear any clots, then pinch both nostrils shut with your thumb and forefinger. Breathe through your mouth and hold that pressure for a full 10 to 15 minutes without letting go to check. If it’s still bleeding after the first round, pinch again for another 15 minutes.
A nosebleed that lasts longer than 30 minutes, involves a large amount of blood, or makes it difficult to breathe needs emergency medical attention. The same applies if nosebleeds are happening frequently without an obvious cause, or if you’re on blood-thinning medication and can’t get the bleeding to stop.