Constant nosebleeds are most often caused by dryness and minor trauma to the blood vessels lining the front of your nose. About 60% of people experience a nosebleed at some point in their lives, but fewer than 10% ever need medical attention for one. When nosebleeds become frequent, though, there’s usually an identifiable trigger, and sometimes an underlying condition worth investigating.
Where Most Nosebleeds Start
The vast majority of nosebleeds originate from a small cluster of blood vessels near the front of the nasal septum, the wall dividing your two nostrils. This area sits close to the surface and is fed by several converging blood vessels, making it especially vulnerable to irritation. Because the tissue here is thin and exposed to incoming air, even minor disruptions can open a vessel and start bleeding.
A smaller percentage of nosebleeds start deeper in the nose, toward the back. These posterior nosebleeds tend to bleed more heavily, sometimes draining down the back of the throat rather than out the front. They’re more common in older adults and more likely to need medical treatment.
The Most Common Everyday Causes
Two triggers account for the bulk of recurrent nosebleeds: physical trauma and dry air. Nose picking and forceful nose blowing are the leading local causes, and many people don’t realize how often they’re doing either one. Even light, habitual rubbing inside the nostril can reopen a healing vessel and restart the cycle.
Dry indoor air, especially during winter when heating systems run constantly, pulls moisture from the nasal lining and leaves it cracked and fragile. The ideal indoor humidity for protecting nasal tissue is 40 to 50%. Drop below that range for days or weeks, and the mucous membrane dries out, crusts form, and blood vessels sit exposed. Infections in or around the nostrils, including vestibulitis (an infection of the nasal entrance) and common colds, also inflame the lining and make bleeding more likely.
Medications That Play a Role
Several common medications increase nosebleed frequency or severity. Nasal steroid sprays, widely used for allergies and sinus congestion, can thin the tissue of the septum over time. They rarely cause dangerous bleeds, but they’re a frequent culprit behind low-grade, recurring ones. A major contributor is improper spray technique: if you aim the nozzle straight toward the septum, the jet of medication hits the same delicate tissue repeatedly. The correct method is to use the opposite hand for each nostril (right hand for the left nostril, left hand for the right), angling the nozzle up and slightly outward, roughly toward the corner of your eye. This directs the spray away from the septum and onto the outer nasal wall where it’s meant to go.
Blood thinners like aspirin, clopidogrel, and warfarin don’t directly cause nosebleeds, but they reduce your blood’s ability to clot. That means a bleed that would normally stop in a few minutes can last much longer and lose more blood. If you’re on any of these medications and noticing frequent nosebleeds, that’s worth flagging with your prescriber. Isotretinoin, used for severe acne, is another known trigger because it dries out mucous membranes throughout the body, including the nose.
Blood Clotting Disorders
When nosebleeds are truly constant, spontaneous (no picking, no dry air, no obvious trigger), and hard to stop, a bleeding disorder may be involved. Von Willebrand disease is the most common inherited bleeding disorder. It affects a protein that helps platelets stick together at the site of an injury. Without enough of this protein, or with a version that doesn’t function properly, clots form slowly or incompletely, and bleeding takes longer to stop.
Nosebleeds caused by von Willebrand disease tend to have a recognizable pattern. They start without any injury, happen five or more times per year, last longer than 10 minutes, and sometimes require packing or a medical procedure to stop. If that description matches your experience, a blood test can check for the condition.
Hereditary Hemorrhagic Telangiectasia
A less common but important cause of recurrent nosebleeds is hereditary hemorrhagic telangiectasia, or HHT. This genetic condition causes abnormal blood vessels to form in the lining of the nose, and frequent nosebleeds are its most common symptom. The abnormal vessels lack the normal structure that lets them constrict and seal when damaged, so bleeding can be frequent and hard to control. HHT is typically diagnosed based on clinical signs and family history, since it runs in families. Genetic testing can confirm it.
High Blood Pressure and Nosebleeds
The relationship between high blood pressure and nosebleeds is complicated and still debated. A large population study in 2020 found that people with hypertension were 1.47 times more likely to experience nosebleeds than people without it, and more likely to need hospitalization when they did. But researchers haven’t been able to establish a clear cause-and-effect link. What does seem consistent across studies is that high blood pressure makes nosebleeds more severe and harder to control once they start. If you have hypertension and frequent nosebleeds, managing your blood pressure may reduce both their frequency and intensity.
Age Makes a Difference
Nosebleed frequency follows a two-peak pattern across the lifespan. The first peak hits children between ages 2 and 10, when nose picking is common, nasal tissue is thin, and frequent colds keep the lining inflamed. The second peak occurs in adults between 50 and 80, when blood vessels become more fragile, blood pressure issues are more prevalent, and anticoagulant use is more common. A child under 2 who has a nosebleed should be evaluated by a pediatrician, since nosebleeds are unusual in that age group.
Structural Problems in the Nose
A deviated septum, where the wall between your nostrils is significantly off-center, can cause airflow to concentrate on one side. That uneven airflow dries out the exposed tissue faster and makes nosebleeds more likely on the affected side. A septal perforation, an actual hole in the septum, creates turbulent airflow and exposes raw edges of tissue that bleed easily. Perforations can result from previous surgery, injury, chronic infections, or cocaine use, and they’re usually visible during a standard nasal exam.
How Recurrent Nosebleeds Are Treated
For most people, the first line of treatment is moisture. Applying saline gel inside the nostrils, running a humidifier to keep indoor air at 40 to 50% humidity, and avoiding nose picking or aggressive blowing can break the cycle within a few weeks. If a visible blood vessel keeps reopening, a doctor can seal it with a procedure called cauterization. The standard approach uses silver nitrate, a chemical applied directly to the vessel and surrounding tissue during an office visit. Only one side of the septum is treated at a time to avoid damaging the tissue. Afterward, you’ll use saline gel to keep the area moist while it heals, and over-the-counter pain relievers can handle any burning sensation.
For nosebleeds tied to a bleeding disorder or HHT, treatment focuses on the underlying condition. That might include medications that help with clotting, specialized nasal treatments, or in more severe cases, procedures to address abnormal blood vessels directly.
Signs That Need Prompt Attention
Most nosebleeds look alarming but aren’t dangerous. A few patterns, however, warrant quick evaluation. Bleeding that flows heavily down the back of your throat rather than out the front suggests a posterior nosebleed, which can be difficult to stop without medical help. Nosebleeds accompanied by vomiting, trouble breathing, or significant blood loss need emergency attention. And nosebleeds that keep recurring despite basic prevention measures deserve investigation for an underlying cause, particularly if they last longer than 10 minutes, happen multiple times a month, or start without any clear trigger.