Can COVID-19 Cause Blood Clots in Your Nose?

February 17, 2024

Featured image for “Can COVID-19 Cause Blood Clots in Your Nose?”

Nosebleeds always prove unpleasant and inconvenient, but most resolve quickly with simple first aid. However, new concerns surrounding COVID-19 blood clots means distinguishing an ordinary nosebleed from more sinister clotting issues merits caution following coronavirus infection.

This guide covers the current science on COVID-19’s clotting risks, warning signs of nasal clots, and recommendations for reducing complications. Better understanding this relationship empowers patients to self-advocate when pressing symptoms arise.

How Blood Clots Intersect With COVID-19

Early in the pandemic, doctors noted unusually high rates of blood clots (thrombosis) in hospitalized COVID patients – even individuals on preventative blood thinners. These clots most frequently develop in the legs and lungs, but also arise in the heart, brain, and other areas, often with catastrophic consequences like stroke, heart attack, and pulmonary embolism.

Analysis of over 48,000 hospitalized coronavirus patients uncovered a 16.5% rate of thrombotic complications – a startlingly high incidence. Furthermore, autopsy studies reveal tiny micro-clots pervading critical organs.

Researchers now recognize improper blood clotting as a defining outcome of moderate to severe COVID-19, though what mechanisms underpin this remain under investigation. Theories include:

  • Viral binding – SARS-CoV-2 directly infects and activates blood vessel lining cells
  • Severe inflammation – Cytokine release triggers clotting cascade hyperactivation
  • Low oxygen – Hypoxia shifts hemostatic balances towards thrombosis
  • ACE2 imprinting – Viral imprinting alters clotting kinetics long-term

Notably, patients with milder ambulatory COVID cases likely share lower, but still elevated clotting risks versus the general population. So this possibility warrants consideration even following recovery.

Artboard 1 copy 2 20

Bloody nasal discharge doesn’t rank among common overt COVID-19 symptoms like fever or cough. However, with frequent blowing and raw inflamed nasal tissues, some congested patients do experience periodic nosebleeds or blood-tinged mucus.

Critically, there exists an anatomical intersection between the nose and head veins prone to clotting issues following coronavirus infection. Behind the eyes and forehead extends an intricate network of veins called the cavernous sinus which drains the face and connects to the nasal sinus system.

In rare instances, infection or inflammation within this venous plexus provokes blood clot formation – a dangerous condition termed cavernous sinus thrombosis (CST). Due to the nasal linkage, CST can initially manifest with nosebleeds prior to escalating.

So while not a sure bet, nosebleeds post-COVID do deserve added gravity versus prepandemic incidents given the disease’s clotting footprint. Rapid worsening or other neurological red flags warrant prompt assessment in case early thrombosis brews. Catching blood clots before advancing proves instrumental in deterring disability or death.

Root Causes of Nasal Bleeding and Clots After COVID

Assorted variables seemingly converge to elevate nasal bleeding and/or clotting risks surrounding COVID-19 infection, including:

Inflamed Fragile Blood Vessels

The SARS-CoV-2 virus notoriously inflames endothelial tissue it infiltrates throughout the body, including the nose’s delicate mucous membranes. This manifests through symptoms like loss of smell, congestion, or sinus pain. Fragile inflamed vessels then rupture more readily.

Blood Thinners and Anticoagulants

To counteract clotting concerns in hospitalized patients, providers liberally prescribe preventative blood thinners like heparin or enoxaparin. But these dramatically heighten bleeding risks like nosebleeds in ambulatory outpatients.

Dry nostrils

High-flow nasal oxygen tubes during COVID treatment further dries and cracks the nose’s mucosa, instigating bleeds and crusting. Any resultant abrasions also afford ingress for bacterial coinfections that damage tissue and inflame regional veins.

Nasal Swabs

Repeated nasal COVID testing itself poses some mechanical risk of microscopic lining tears that could bleed ormaybe permit vascular access by the virus or bacteria.

Hypercoagulable Blood

In predisposed patients, viral imprinting seemingly alters coagulation dynamics for months post-infection, with blood remaining abnormally “sticky.” This primes clot development with any endothelial turbulence.

Pinpointing the precise triggers for rare cases of nasal bleeding and clots after COVID proves elusive. Yet the collective weight of evidence makes chance association unlikely.

Artboard 1 copy 25

Warning Signs of Nasal Blood Clotting Issues

Most nosebleeds require only simple first aid, while even fairly heavy or prolonged bleeding rarely indicates imminent peril.

However, with COVID-19 having upended conventional medical paradigms, patients must vigilantly monitor bleeding episodes for additional red flags portending underlying clotting issues. Alongside nosebleeds, watch for these high-alert symptoms:

  • Severe sudden headaches concentrated around eyes or forehead
  • Accompanying vision changes like blurred or double vision
  • Numbness, weakness or reduced sensation in the face or extremities
  • Swelling or skin redness over the nose, eyes and cheek
  • Development of a pronounced unilateral bloodshot eye
  • New inability to move certain facial muscles like squinting

Rapidly progressing symptoms demand urgent evaluation, even without overt nasal bleeding. Headache with neurological deficits requires a triage for possible cavernous sinus thrombosis.

Catching clots early before advancing proves instrumental for preserving vision, averting stroke, and deterring secondary brain abscesses. When in doubt, err towards caution.

Diagnostic Testing to Rule Out Nasal Blood Clots

Distinguishing a benign occasional nosebleed from an insidious nasal clot predicated on symptoms alone proves impossible – the presentations overlap considerably early on. Confirmatory testing enables decisive triage towards anticoagulation or continued observation.

Gold standard radiographic diagnoses include:

  • MRI/MRV scan – Provides detailed vein anatomy to pinpoint thrombosis
  • CT head – Quickly captures thrombus size and location
  • Carotid Doppler ultrasound – Assesses blood flow dynamics in neck arteries

Lab work like D-dimer tests also indicates unchecked clotting activity necessitating treatment. Portable POC devices enable rapid bedside results.

Recall blood clots frequently materialize in COVID-19 absent the usual causative triggers. Thus maintaining a high index of suspicion empowers early detection and faster recovery. Discuss any concerns following COVID infection with your physician.

Can Nasal Blood Clot Risks Be Prevented After COVID?

Definitively forestalling rare venous blood clots proves improbable regardless of circumstances. However, certain basic precautions following COVID-19 infection seem prudent for lowering probabilities in high-risk subgroups:

  • Carefully monitoring symptoms – Rapidly seek care for any unusual headache, vision issues and facial numbness or tingling. Quick treatment response leads to better outcomes.
  • Avoiding blood thinners – Unless medically indicated, steer clear of anticoagulant medications, antiplatelets, and NSAIDs which heighten bleeding risks.
  • Supportive nasal hygiene – Gentle saline sprays, emollients and humidification heal damaged nasal tissues and prevent re-injury.
  • Boosting circulation – Light activity, hydration, compression stockings and elevating the head while resting boosts venous return flow.
  • Mitigating medical risk factors – Carefully control glucose, cholesterol, hypertension and mitigate lifestyle variables exacerbating vascular disease.

Though not confirmed preventative, these conservative measures align with common sense post-viral recovery practices. Patients managing associated risk factors always fare better.


FAQs – COVID-19 and Nasal Blood Clots

Are nosebleeds a primary symptom of COVID-19 infections?

No. While possibly tied to chronic nasal moisture loss or irritation from severe inflammation, epistaxis nosebleeds do not directly stem from coronavirus infection and only develop in a minority of cases.

How often do dangerous blood clots like CST occur after COVID?

Exact statistics remain undetermined, but likely less than 1% of recovering COVID patients based on very limited case reports thus far. Future research should clarify incidence rates across different patient populations.

If I had COVID, should I worry about every random nosebleed now?

Not necessarily. The vast majority of post-COVID nosebleeds lack clinical significance and quickly resolve, same as prepandemic. However, any worsening or expanding bleeds beyond a day warrant reevaluation for clots.

What provides definitive diagnosis of a nasal blood clot?

Advanced CT, MRV and ultrasound imaging visualizes the presence, size and location of sinus vein blood clots based on radiographic density. Contrast dyes often assist detection. Lab work confirms clotting activity.

Can nasal blood clots increase my stroke risk after COVID?

Yes. Cavernous sinus thrombosis can extend clots towards the brain’s venous drainage system, leading to infarction strokes. Rapid anticoagulation aims to arrest clot expansion before this occurs.

In Conclusion: Key Takeaways

In summary, links exist between COVID-19 and both nosebleeds and the rare cavernous sinus thrombosis blood clots based on the virus’ pathological proclivity for improper clotting paired with nasal endothelial vulnerabilities. Patients managing post-COVID symptoms should note the following:

  • Blood clots represent a leading driver of COVID-19 mortality due to circulating factors like inflammation, hypoxia and bound endothelium activating the clotting cascade
  • Nosebleeds occur in a minority of congested cases due to agitatedinflamed nasal tissues, though cyst risk remains low unless advancing in severity or neurological features develop
  • Cavernous sinus thrombosis constitutes a rare but serious neurological complication, presenting with headache, vision changes and numbness requires urgent evaluation
  • Preventative measures like hydration, light activity, gentle nasal hygiene and monitoring clotting risk factors plays a sensible role postinfection

While an ordinary nosebleed following COVID-19 likely proves innocuous with standard self-care, patients should recognize crucial clinical tipping points requiring prompt reevaluation. Open dialogue with your doctor regarding even minor bleeding that defies resolution often pays significant future dividends. Ultimately knowledge and a vigilant posture serve our best allies fighting this virus and its complications.

Rate this post

Related articles


Cold Plasma System

The world's first handheld cold plasma device

Learn More

Made in USA