The three most common causes of nosebleeds are dry air, nose picking or minor trauma, and injuries to the face or nose. Most nosebleeds originate from the front of the nasal septum, where a dense network of small blood vessels sits just beneath a thin layer of tissue. That combination of fragile vessels and minimal protection is why nosebleeds are so common and so easily triggered.
Dry Air
Dry air is the single most common cause of nosebleeds. When humidity drops, whether from winter heating systems, arid climates, or air conditioning, the delicate membrane lining your nose dries out. That tissue becomes crusty and cracked, making it far more likely to bleed when you blow your nose, rub it, or even breathe forcefully. This is why nosebleeds spike during cold-weather months when indoor air is driest.
The fix is straightforward: adding moisture back into the air with a humidifier and keeping the inside of your nose from drying out. A thin layer of saline nasal spray or a water-based nasal gel can keep the lining hydrated. If you’re prone to nosebleeds in winter, running a humidifier in your bedroom at night makes a noticeable difference for most people.
Nose Picking and Minor Trauma
Repeated nose picking is the next most frequent cause, and it’s especially common in young children. Picking at the inside of the nose creates small ulcers on the septum’s lining that bleed easily and heal slowly, particularly if a child keeps picking at the same spot. Adults do it too, often unconsciously, but the pattern is most visible in kids because their blood vessels sit closer to the surface and their fingers are frequently in their noses.
Other forms of minor local trauma count here as well: inserting objects into the nose (another common culprit in children), vigorous nose blowing during a cold, and irritation from nasal or sinus infections. Any of these can rupture the small vessels at the front of the nose. The bleeds tend to be one-sided, relatively brief, and easy to stop with direct pressure.
Facial and Nasal Injury
A direct hit to the nose or face, from a fall, a sports collision, or any kind of accident, commonly causes a nosebleed. These bleeds can be heavier than the ones caused by dry air or picking because the force of impact can damage larger vessels or affect both sides of the nose. A nosebleed after facial trauma that won’t stop, or one accompanied by swelling or a visibly crooked nose, may signal a fracture that needs medical attention.
Other Factors That Increase Risk
Beyond the top three causes, several other factors make nosebleeds more likely or harder to control. Blood-thinning medications are a major one. In studies of patients who show up to the emergency department with nosebleeds, roughly 50% to 60% are taking some form of anticoagulant or antiplatelet therapy. These medications don’t necessarily start the bleed, but they make it last longer and harder to stop on your own. If you take a blood thinner and notice more frequent nosebleeds, that’s worth mentioning to your doctor.
High blood pressure has a more complicated relationship with nosebleeds than most people assume. Research published in the Journal of the Saudi Heart Association found no definite evidence that high blood pressure initiates nosebleeds. However, patients with elevated blood pressure during a nosebleed episode were more likely to need more aggressive treatment to get the bleeding under control. In other words, hypertension may not cause the bleed, but it can make it worse. The elevated reading seen in the emergency room may also partly reflect the stress of having a nosebleed in the first place.
Nasal and sinus infections round out the list. Inflammation and swelling from an infection make the nasal lining more fragile, and the repeated nose blowing that comes with congestion adds mechanical stress to already irritated tissue.
How to Stop a Nosebleed
Sit upright and lean slightly forward so blood doesn’t run down your throat. Pinch both nostrils shut using your thumb and index finger, applying firm, steady pressure to the soft lower third of the nose, not the bony bridge. Hold that pressure for 10 to 15 minutes without letting go to check. If the bleeding hasn’t stopped after that first round, pinch again for another 15 minutes, keeping continuous pressure for at least five minutes at a stretch.
Most nosebleeds resolve with this technique alone. Bleeding that persists beyond 30 minutes of steady pressure, recurs frequently on the same side, or produces a large volume of blood warrants professional evaluation. Recurrent nosebleeds that keep coming back despite basic treatment may need a closer look with a small camera inside the nose to find the exact bleeding site and treat it directly.