Is It Normal to Have a Bloody Nose When Sick?

Getting a nosebleed while battling a cold, flu, or sinus infection is common and almost always harmless. Up to 60 percent of people experience at least one nosebleed during their lifetime, and respiratory illnesses are one of the most frequent triggers.¹ The combination of nasal inflammation, repeated nose-blowing, and dry indoor air creates ideal conditions for the delicate blood vessels lining your nose to break open. Understanding why it happens, when it warrants concern, and how to handle it properly can save you unnecessary worry during an already miserable week.

Why Respiratory Infections Cause Nosebleeds

When a virus takes hold in your upper airways, it doesn’t just sit there quietly. Viral replication in the nasal lining triggers a cascade of inflammatory mediators that produce the familiar symptoms of congestion, runny nose, and swelling.² That inflammation makes the tissue inside your nose swollen, warm, and engorged with extra blood flow. The mucous membranes become fragile, and the tiny blood vessels sitting just beneath the surface are more easily ruptured.

On top of that inflammation, you’re blowing your nose constantly, wiping it with tissues, and possibly sneezing with force. Each of those actions puts mechanical stress on tissue that’s already irritated. If congestion forces you to breathe through your mouth at night, the nasal lining dries out even further, making those blood vessels more brittle. The result is that a nosebleed during a cold or flu is less a sign that something is wrong and more a predictable side effect of everything your nose is going through.

The Dry Air Connection

Most colds and flu circulate during the colder months, and that timing matters. Cold outdoor air holds less moisture, and indoor heating dries the air further. Low relative humidity causes water to evaporate from the nasal surfaces, leading to mucosal drying that makes nosebleeds more likely even in healthy people. When you add an active respiratory infection on top of that baseline dryness, the risk goes up considerably.

This is why nosebleeds during illness often happen at night or first thing in the morning. You’ve spent hours in a heated bedroom with dry air, breathing through your mouth because your nose is stuffed. By morning, the nasal lining may be so parched that even a gentle blow is enough to start bleeding. Running a cool-mist humidifier in your bedroom during illness can make a real difference. Keeping indoor humidity somewhere around 30 to 50 percent helps the nasal mucosa stay moist enough to resist cracking.

How to Stop a Nosebleed Properly

The correct first-aid technique is simple, but a surprising number of people get it wrong. Even among medical professionals, knowledge of proper nosebleed management is uneven. A multi-center study found that most medical staff showed poor knowledge of the correct site for applying pressure during a nosebleed, and the majority were unfamiliar with how long to hold pressure.³ If trained professionals struggle with the details, it’s worth reviewing the steps yourself.

Here’s what to do:

Sit up and lean forward: Tilting your head back is one of the most persistent myths. It doesn’t stop the bleeding; it just sends blood down your throat, which can cause nausea and makes it impossible to tell when the bleeding has actually stopped. Lean slightly forward so the blood drains out of your nose instead.
Pinch the soft part: Use your thumb and index finger to pinch the fleshy lower portion of your nose, below the bony bridge. This is where most nosebleeds originate. Pinching the hard bony part higher up does nothing useful.
Hold for at least 10 minutes: Time it with a clock. Releasing early to check whether the bleeding has stopped restarts the clotting process. Resist the urge to peek.
Avoid nose-blowing afterward: Once the bleeding stops, leave the clot alone for several hours. Blowing your nose immediately can dislodge it and restart the bleed.

If bleeding continues beyond 20 minutes of steady pressure, or if the flow is heavy enough that blood is streaming rather than dripping, that’s the point where medical attention is reasonable.

Medications That Make Nosebleeds More Likely During Illness

Several common medications used to treat cold and flu symptoms can independently increase the chance of a nosebleed. Intranasal corticosteroid sprays, which many people use for congestion or allergies, list epistaxis as their most notable topical side effect.⁴ If you’re already using one of these sprays regularly and then develop a cold, the combination of inflamed tissue and the spray’s drying effect on the mucosa can tip the balance toward bleeding.

Decongestant nasal sprays (the ones that shrink swollen tissue to open your airways) present a different problem. They work by constricting blood vessels, and when used for more than a few days in a row, they can cause rebound swelling that leaves the tissue more congested and irritated than before. That cycle of constriction and rebound damages the mucosal surface over time.

Beyond nasal sprays, people who take blood thinners or antiplatelet medications are more prone to nosebleeds in general and especially during illness. Aspirin, warfarin, and newer anticoagulants all reduce the blood’s ability to clot, which means a small vessel break that would seal itself quickly in most people can turn into a longer, more noticeable bleed.¹ If you’re on one of these medications and notice more frequent nosebleeds during a respiratory infection, it’s worth mentioning to your doctor, though it usually doesn’t mean you need to change your medication.

Certain supplements can also increase bleeding tendency. Ginkgo biloba, policosanol, high-dose vitamin E, and garlic supplements all have mild blood-thinning properties. People rarely think of these as medications, but during illness when the nasal lining is already fragile, they can be a contributing factor.

Nosebleeds in Sick Children

If you have kids, you’ve probably dealt with more nosebleeds than you can count. More than half of all children experience at least one nosebleed by age 10, and about 9 percent have recurrent episodes.⁵ The vast majority are benign and don’t need any workup beyond standard first aid.

Children are especially prone to nosebleeds during illness for a few overlapping reasons. Their nasal blood vessels sit closer to the surface than in adults, which means less tissue cushioning between the blood supply and the outside world. Kids also tend to be more aggressive nose-pickers and face-rubbers when they’re congested, and they don’t always blow their nose gently. A toddler with a cold who keeps rubbing or digging at a stuffy nose is practically guaranteed to produce the occasional bleed.

Seasonal patterns are worth noting. Children’s nosebleeds spike during fall and winter, when respiratory infections are most common and air is driest. If your child gets nosebleeds mainly during cold season and they resolve with the techniques described above, there’s rarely anything to investigate. Recurrent nosebleeds that happen outside of illness, that are difficult to stop, or that are accompanied by easy bruising elsewhere on the body are the ones that may warrant a conversation with a pediatrician. Standardized bleeding questionnaires can help clinicians decide whether further testing is needed, taking into account how often the bleeds happen, how long they last, and how severe they are.⁵

COVID-19 and Nosebleeds

During the pandemic, researchers noticed that nosebleeds appeared to be more common in COVID-19 patients than expected. A prospective study found that 15 percent of patients presenting with nosebleeds tested positive for SARS-CoV-2, compared with just 2.5 percent of a control group, a statistically significant difference.⁶ A larger evaluation of nearly 700 COVID-19 patients found that about 4.4 percent reported epistaxis as a symptom, ranking it well below cough and sore throat but still notable enough to track.⁷

The connection likely involves the same mechanisms at play in other respiratory infections, but amplified. SARS-CoV-2 has a particular affinity for cells in the nasal lining, and the intense inflammatory response it provokes can damage mucosal tissue more aggressively than a typical cold virus. The virus also appeared to affect blood vessel walls in some patients, adding another layer of fragility. While a nosebleed alone was never considered a reliable indicator of COVID specifically, the research confirmed that the same general principle applies: any virus that inflames the nasal passages can cause bleeding, and more aggressive infections tend to cause it more often.

Prevention Strategies When You’re Already Sick

You can’t always prevent a nosebleed during a respiratory illness, but a few practical steps reduce the odds significantly:

Use saline spray or gel: Applying saline nasal spray several times a day keeps the inside of your nose moist. Saline gel or a thin layer of petroleum jelly just inside the nostrils provides longer-lasting protection, especially before bed.
Humidify your sleeping area: A cool-mist humidifier counteracts the drying effects of indoor heating. Clean it regularly to avoid blowing mold spores into the air, which would make your congestion worse.
Blow gently, one side at a time: Press one nostril closed and blow softly through the other. Forceful two-nostril blowing increases pressure dramatically and is one of the most common triggers for a bleed during a cold.
Switch to soft tissues: Rough or stiff tissues abrade the skin around and just inside the nostrils. Tissues with lotion or aloe reduce friction.
Aim nasal sprays sideways: If you’re using a nasal spray, angle the nozzle slightly away from the center wall of your nose (the septum). The septum is where most anterior nosebleeds originate, and repeatedly spraying medication directly onto it increases irritation.

None of these steps are complicated. The challenge is remembering to do them when you feel terrible and just want to get through the day. Keeping a saline spray on your nightstand during cold season so it’s within reach is one of the simplest interventions available.

Older Adults and Higher-Risk Groups

While nosebleeds during illness are usually harmless across all age groups, certain populations face a greater risk of more serious episodes. Nosebleeds are more frequent in people on supplemental oxygen, anticoagulation therapy, or antiplatelet drugs, and in those with other conditions that predispose them to bleeding.¹ Older adults are disproportionately represented in all of those categories.

High blood pressure, which is more common with age, doesn’t directly cause nosebleeds but can make them harder to stop once they start. Elevated pressure keeps blood flowing through the broken vessel with more force, meaning the clotting process has to work against a stronger current. If you’re an older adult with hypertension who develops a cold, it’s worth being more attentive to prevention measures like humidification and gentle nose-blowing. It’s also worth knowing that epistaxis is the most common otolaryngology-related emergency and accounts for roughly one in 200 emergency department visits in the United States.¹ Most of those visits involve bleeding that could be managed at home with proper technique, but for people on blood thinners or with clotting disorders, the threshold for seeking help should be lower.

When a Nosebleed During Illness Needs Attention

The overwhelming majority of nosebleeds that occur during a cold or flu will stop on their own with proper first aid. Only about 6 to 10 percent of all nosebleeds, across all causes, require medical intervention.¹ That said, a few scenarios call for prompt evaluation:

Bleeding that won’t stop: If 20 minutes of continuous pressure hasn’t slowed the bleeding, you need medical help. Don’t keep resetting the clock by letting go to check.
Heavy, fast bleeding: A slow drip is normal. Blood pouring from both nostrils or flowing rapidly down the back of your throat is not.
Bleeding after a head injury: If your nosebleed started after hitting your head or face, especially if clear fluid is also draining from the nose, seek evaluation immediately.
Frequent recurrence: One or two nosebleeds during a week-long cold is unremarkable. Daily nosebleeds that continue after the illness resolves suggest something else is going on.
Difficulty breathing: Large clots or heavy bleeding that interferes with your ability to breathe through either your nose or mouth warrants urgent care.

People on anticoagulants should have a lower threshold for calling their doctor. The medication that prevents dangerous clots elsewhere in the body also prevents the helpful clot you need inside your nose, and what would be a minor annoyance for someone else can become a more prolonged event. Your doctor won’t be surprised by the call and can advise whether any adjustment is needed.

Posterior Versus Anterior Bleeds

Most nosebleeds during illness originate in the front of the nose, in an area rich with small blood vessels on the nasal septum. These anterior nosebleeds are the ones that respond well to pinching and pressure. They’re messy but manageable.

Posterior nosebleeds, which start deeper in the nasal cavity, are a different situation. They’re less common overall and rare in the context of a simple cold, but they produce bleeding that drains primarily down the back of the throat rather than out the front of the nose. You might not even realize you have a nosebleed; instead, you notice you’re swallowing blood or spitting it out. Posterior bleeds are harder to control with home measures because the bleeding site is out of reach, and they occur more often in older adults with hypertension or clotting issues. If you suspect the blood is coming from deep in the nose rather than the front, particularly if it’s substantial, that’s a scenario where emergency care is appropriate. Posterior nosebleeds sometimes require nasal packing or cauterization that can only be done in a clinical setting.

1
Lynchburg Journal of Medical Science. Stop the Bleed! Acute Epistaxis Management
2
PubMed. Clinical significance and pathogenesis of viral respiratory infections
3
PubMed. Epistaxis first-aid: a multi-center knowledge assessment study among medical workers
4
PubMed. Intranasal corticosteroids topical characteristics: side effects, formulation, and volume
5
PubMed Central. Recurrent epistaxis in children
6
PubMed Central. Epistaxis as a marker for severe acute respiratory syndrome coronavirus-2 status – a prospective study
7
The Egyptian Journal of Otolaryngology. Comprehensive evaluation of otorhinolaryngological symptoms in COVID-19 patients