A nosebleed is bleeding from the blood vessels inside your nose, and it’s extremely common. Up to 60% of people will have at least one nosebleed in their lifetime, though only about 6% end up needing medical attention. Most nosebleeds look alarming but stop on their own with simple pressure.
Where Nosebleeds Start
The vast majority of nosebleeds are “anterior,” meaning they start near the front of the nose. A cluster of small blood vessels sits on the lower front part of the nasal septum (the wall dividing your two nostrils) in an area called Kiesselbach’s plexus. These vessels are close to the surface, fragile, and easy to irritate. When one breaks, blood flows out of one or both nostrils.
Less commonly, a nosebleed originates deeper in the nose, toward the back. These posterior nosebleeds tend to produce heavier bleeding that can drain down the throat rather than out the front. They’re more common in older adults and are harder to stop at home. If you feel blood running down the back of your throat during a nosebleed, that’s a sign it may be posterior.
Common Causes
Dry air is the single most common trigger. Hot, low-humidity climates, high altitudes, and heated indoor spaces all dry out the delicate lining inside your nose. Once that tissue becomes dry and cracked, even light nose-blowing or rubbing can rupture a blood vessel. This is why nosebleeds spike in winter months when indoor heating runs constantly.
Beyond dry air, several everyday factors can set off a nosebleed:
- Nose picking or inserting objects, which physically damages the lining
- Colds, sinus infections, and allergies, because repeated sneezing, coughing, and blowing inflames the tissue
- Overuse of nasal sprays (antihistamine or decongestant types), which dry out the membranes
- Blood-thinning medications like aspirin, ibuprofen, or prescription anticoagulants, which make bleeding easier to start and harder to stop
- Facial injuries, from a bump during sports to a fall or car accident
- Chemical irritants, including cleaning supply fumes and strong workplace odors
- A deviated septum, which creates uneven airflow that dries one side more than the other
Recreational drugs inhaled through the nose, particularly cocaine, are another well-known cause. Alcohol use can also contribute because it widens blood vessels and can interfere with clotting.
Less Common but Serious Causes
Frequent or unusually heavy nosebleeds sometimes point to an underlying health issue. Bleeding disorders like hemophilia and von Willebrand disease impair the body’s ability to form clots, so even minor vessel breaks bleed longer than they should. Immune thrombocytopenia, a condition where platelet counts drop too low, has a similar effect.
A rare genetic condition called hereditary hemorrhagic telangiectasia causes abnormal blood vessel formations in the nose and elsewhere in the body, leading to recurrent nosebleeds that can be severe. Leukemia and other blood cancers can also show up as unexplained, repeated bleeding. Nasal polyps and, rarely, nasal tumors are other possibilities. High blood pressure doesn’t typically cause nosebleeds on its own, but it can make an existing bleed harder to stop.
Pregnancy deserves a mention here too. Increased blood volume and hormonal changes make the nasal lining more prone to swelling and bleeding during pregnancy, so nosebleeds are noticeably more frequent for some people.
How to Stop a Nosebleed
The technique matters more than most people realize, and the most common instinct (tilting your head back) is exactly wrong. Here’s what actually works:
Sit upright and lean slightly forward. This keeps blood from running down your throat, which can cause nausea or make you cough. Pinch the soft, fleshy lower third of your nose (not the bony bridge) firmly between your thumb and finger. Hold that pressure steadily for 10 to 15 minutes without letting go to check. Releasing early is the most common reason home treatment fails, because the clot needs uninterrupted time to form.
If the bleeding hasn’t stopped after 15 minutes, pinch again for another 15 minutes. You can also try spraying a few sprays of an over-the-counter nasal decongestant into both nostrils before re-pinching. These sprays narrow the blood vessels temporarily and can help the area clot. If you’ve been pressing for 30 minutes total and the bleeding continues, that’s the point where you need emergency medical care.
What Happens at the Doctor’s Office
When a nosebleed won’t stop with pressure alone, a doctor has several tools available. The first step is identifying where the bleed is coming from. If they can see the specific spot, they may apply a chemical (typically silver nitrate) or use a small electrical device to seal the broken vessel. This is called cautery. They’ll numb the area first, and the procedure is brief.
If bleeding is too heavy to pinpoint the source, the next step is nasal packing. This involves placing a sponge-like material or inflatable device inside the nostril to apply direct pressure against the bleeding vessel. Some packing materials dissolve on their own over time, which is especially useful for people on blood thinners or with clotting disorders, since removing traditional packing could restart the bleed.
For rare, severe cases where packing and cautery don’t work, surgeons can tie off or block the artery supplying blood to the area. This is uncommon and reserved for persistent or recurrent bleeding that resists other treatments.
When a Nosebleed Needs Emergency Care
Most nosebleeds are harmless nuisances, but a few scenarios call for immediate medical attention. Get emergency help if a nosebleed lasts longer than 30 minutes despite steady pressure, follows a serious injury like a fall or car accident, involves a large amount of blood, or makes it difficult to breathe. Nosebleeds in children younger than 2 also warrant a prompt medical evaluation, since they’re unusual in that age group and more likely to have a specific cause.
If you’re getting nosebleeds frequently (several times a month, for instance) without an obvious trigger like dry winter air, it’s worth having that checked out. Recurrent nosebleeds can be the first noticeable sign of a bleeding disorder or other condition that benefits from early diagnosis.
Preventing Nosebleeds
Since dry air is the top cause, keeping your nasal lining moist is the most effective prevention strategy. A humidifier in your bedroom during winter months makes a real difference. Applying a thin layer of petroleum jelly or saline gel just inside the nostrils before bed protects the tissue overnight when it’s most vulnerable. Saline nasal sprays (the plain saltwater kind, not medicated decongestants) can be used throughout the day to keep things hydrated.
Resist the urge to pick or aggressively blow your nose, especially if you’ve had a recent nosebleed. The healing tissue is fragile for several days afterward, and re-injury is common. If allergies or frequent colds are driving your nosebleeds, managing the underlying congestion with appropriate treatment reduces how often you’re irritating the nasal lining. And if you’re on blood thinners, being extra diligent about nasal moisture becomes doubly important, since any bleed you do get will be slower to stop.