Most nosebleeds come from a small, blood-vessel-rich area on the front wall of the nasal septum, the thin partition dividing your two nostrils. This spot, called Kiesselbach’s plexus (or Little’s area), is where five different arteries send their smallest branches to converge in a patch of tissue just inside the nostril opening. About 90% of all nosebleeds originate here.
The Anatomy Behind Most Nosebleeds
Your nasal cavity has an unusually rich blood supply. Five named arteries feed into it: the anterior ethmoidal artery, the posterior ethmoidal artery, the sphenopalatine artery, the greater palatine artery, and the superior labial artery. Each of these sends tiny terminal branches toward the front of the nasal septum, and they all meet in that single region, Kiesselbach’s plexus. Think of it as a busy intersection where five roads merge into one small area.
What makes this spot so bleed-prone is a combination of factors. The nasal lining is thin, moist mucous membrane rather than tough skin. It sits right at the entrance to the airway, constantly exposed to dry air, dust, allergens, and the mechanical force of blowing or rubbing your nose. The blood vessels here are tiny and sit very close to the surface, with minimal protective tissue between them and the outside world. The nasal lining also serves as a frontline immune barrier against inhaled pathogens, and this constant defensive role contributes to the tissue’s fragility.
Posterior Nosebleeds: A Different Source
The remaining roughly 10% of nosebleeds come from deeper inside the nose, in the back portion of the nasal cavity near the throat. These posterior nosebleeds involve larger blood vessels, particularly branches of the sphenopalatine artery, and tend to bleed more heavily. Instead of dripping out the front of the nose, the blood often runs down the back of the throat, causing a bad taste and sometimes nausea.
Posterior nosebleeds are more common in older adults and people with high blood pressure or blood-clotting problems. Because the bleeding vessels are larger and harder to reach, these nosebleeds are more difficult to stop at home and more likely to need medical treatment.
What Triggers the Bleeding
Roughly 60% of people will experience at least one nosebleed in their lifetime, though only about 6% need medical attention. The triggers fall into two categories: local and systemic.
Local triggers are the most common. Dry air, especially during winter months when indoor heating strips moisture from the air, dries out the nasal lining and makes the tiny vessels brittle. Nose picking, forceful nose blowing, and even just rubbing your nose can rupture these fragile surface vessels. Allergies and upper respiratory infections inflame the lining, making it more vulnerable. Nasal sprays used frequently can also irritate the tissue over time.
Systemic causes involve the rest of the body. High blood pressure is the most common systemic factor. Blood-thinning medications like aspirin and warfarin reduce the blood’s ability to clot, so even a minor vessel break bleeds longer. Chronic alcohol use and kidney problems can impair platelet function, making clotting less effective. Inherited bleeding disorders, including von Willebrand disease and hemophilia, are less common but can cause frequent or hard-to-stop nosebleeds. Cardiovascular conditions like heart failure and hardening of the arteries also contribute.
How to Tell Where Your Bleed Is Coming From
An anterior nosebleed, the common kind, typically drips or streams from one nostril. You can usually see where the blood is coming from if you look in a mirror. It responds to direct pressure and stops within 10 to 15 minutes.
A posterior nosebleed feels different. Blood drains down the back of your throat rather than out the front of your nose, or it comes from both nostrils at once. It tends to be heavier and harder to control. If you’re swallowing blood, feeling nauseated, or the bleeding won’t stop with pressure, you’re likely dealing with a posterior bleed.
Stopping a Nosebleed Correctly
The instinct to tilt your head back is wrong. It sends blood down your throat, which can cause choking or vomiting. Instead, sit upright and lean slightly forward. Pinch both nostrils shut with your thumb and index finger, pressing on the soft, fleshy part of the nose (not the bony bridge). Breathe through your mouth and hold steady pressure for 10 to 15 minutes without releasing to check. If the bleeding hasn’t stopped after the first round, pinch again for another 15 minutes, keeping continuous pressure for at least five minutes at a stretch.
This technique works because you’re compressing the tissue directly over Kiesselbach’s plexus, where the bleeding almost always originates. The sustained pressure gives the tiny ruptured vessels time to clot.
Preventing Recurring Nosebleeds
If you get nosebleeds regularly, keeping the nasal lining moist is the single most effective prevention strategy. A humidifier in the bedroom during dry months helps. Applying a saline nasal gel inside both nostrils daily is even more targeted. In one study of patients on blood thinners who had chronic nosebleeds, 93% had complete resolution after three months of daily saline gel use.
Petroleum jelly works similarly. Using a cotton swab, apply a thin layer inside both nostrils once a day, ideally at bedtime. For people with recurrent mild anterior nosebleeds, a combination of daily petroleum jelly and a mild anti-inflammatory cream applied once weekly to the inside of the nostrils resolved bleeding in 89% of cases within six weeks.
Beyond topical treatments, avoiding the mechanical triggers matters: resist picking, blow your nose gently, and treat underlying allergies or infections that inflame the nasal lining. If you take blood thinners and experience frequent nosebleeds, that’s worth discussing with whoever prescribed the medication, since adjustments to your regimen may reduce episodes without compromising the medication’s purpose.