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Your Snot Holds the Secrets to Your Health

Updated: Tuesday 3 March, 20266 | Read Time: 6 mins

‍Beth Wright

‍

Your snot is more than just a nuisance - it is a diagnostic powerhouse

Far from being just a nuisance caused by colds, hayfever, or changing weather, your snot - or nasal fluid - is emerging as one of the most information-rich indicators of respiratory health [1,2].

Nasal fluid is now being recognised as a powerful window into respiratory immunity, infection, chronic disease, and even conditions beyond the airways.

‍

More than mucus: why our bodies make nasal fluid

Despite its appearance, nasal fluid really is much more than just watery, sticky dust trapped in your nose.

Of course, it is composed of 90% water - but it is also packed with proteins, lipids, metabolites, immune molecules, and microorganisms [3,4].

Although its role in defence is well-known - trapping pollutants, pathogens, and keeping the airway lining protected - emerging research shows nasal fluid does far more than defend; it communicates.

Your nasal fluid is a mirror.

We now understand that your snot reflects how your airways respond to the environment, infection, inflammation, and even long-term disease. This connection between the nose, lungs, and lower airways is even described by the increasingly well-known Unified Airway Concept, which recognises that the parts making up the respiratory system does not act in isolation but is a single, interconnected biological network [5].

‍

How exactly does nasal fluid reflect the body?

Nasal fluid contains tiny molecular signals called ‘biomarkers’.

These biomarkers are anything from proteins, genes, lipids or metabolites. They are highly dynamic and change in response to biological processes and conditions. So, when the body is being affected by disease these signals can be altered. These changes can then be measured, sometimes even before physical symptoms of disease occur [6].

Biomarkers allow scientists and clinicians to detect disease, distinguish subtypes, predict progression, tailor treatments, and monitor responses to therapy.

Research into nasal fluid biomarkers is rapidly progressing, opening the door to earlier (even less invasive) diagnosis, personalised treatment - ultimately new ways of listening and responding to diseases in the human body [7].

‍

Why nasal fluid is emerging as a powerful diagnostic medium

For decades, blood has dominated the diagnostic landscape. But increasingly, researchers are turning their attention to a far more accessible - and perhaps more relevant - source of insight: nasal fluid.

Collecting nasal fluid is simple, quick and minimally invasive.

It doesn’t require the technical expertise of a biopsy or the infrastructure of more complex procedures. And when it comes to respiratory disease, it offers something blood often can’t - a direct window into the airway itself [8]

The nasal lining is the airway’s frontline.

It’s the first point of contact for viruses, allergens, pollutants and environmental triggers. Sampling this environment means capturing biological signals at the site where many respiratory diseases actually begin. Inflammation, infection and immune dysfunction can often be detected here earlier and more precisely than through systemic samples.

What makes nasal fluid even more compelling is that it doesn’t just reflect local airway health. The immune system is intrinsically interconnected. Signals detected in the nasal passage can mirror broader inflammatory and immune pathways across the body - offering potential insights into systemic and even neurological conditions [9].

In other words, nasal fluid isn’t just convenient. It’s biologically strategic.

Who would’ve thought?

‍

From asthma to infection: what else can nasal fluid reveal?

Nasal fluid is showing exciting promise in asthma research.

For instance, certain inflammatory proteins are significantly elevated in people with asthma, while others may decrease. Intriguingly, management of disease can also affect these biomarker profiles.

People with poorly controlled asthma show different nasal biomarker profiles compared to those whose disease is well managed [10].

This is only the beginning.

Scientists, including the team at Diag-Nose, are still investigating the hundreds of biomarkers present in nasal secretions.

We now know that nasal fluid can also help distinguish bacterial versus viral infections, CRS with or without nasal polyps, exposure to air pollution and smoke, some cancers, neurodegenerative diseases, and mood disorders [11-13].

This differentiation can greatly improve patient outcomes as treatment strategies differ even between subtypes. For instance, some subtypes respond well to targeted biologic therapies, while others require different approaches.

‍

Beyond the airways: can nasal fluid reflect brain health?

It might sound surprising, but nasal fluid can actually offer clues about diseases outside of the lungs - going as far as the brain.

In Alzheimer’s disease, toxic proteins such as amyloid-β and tau accumulate years before symptoms appear [10].

Researchers have now detected these biomarkers in nasal fluid, raising the possibility of simple, non-invasive screening for neurodegenerative disease - potentially years earlier than current methods allow.

‍

‍

Decoding your body through your nose

Every sniffle, drip, or runny nose carries data.

Let’s put it this way - nasal fluid is less of an inconvenience and more of a microscopic logbook - quietly tracking your immune system, environmental exposures, disease signals, often before you feel a thing.

As researchers get better at decoding these molecular messages, nasal fluid is reshaping diagnostics - shifting from reactive testing to earlier, smarter detection.

So next time you reach for a tissue, consider that it’s not just a nuisance - it’s a real-time readout of your biology, telling the story of your health in ways we’re only just beginning to understand.

‍

‍

References

  1. Chen M, Ge Y, Zhang W, Wu P, Cao C. Nasal Lavage Fluid Proteomics Reveals Potential Biomarkers of Asthma Associated with Disease Control. J Asthma Allergy. 2024 May 16;17:449-462. doi: 10.2147/JAA.S461138. PMID: 38770268; PMCID: PMC11104442.
  2. Rosado-Alicea J, Morton S, Brown A, Akenroye A et al. Mass Spectrometric Analysis of Nasal Fluid Proteomics Reveals Differentially Expressed Proteins in Allergic Asthmatics, Journal of Allergy and Clinical Immunology. AB111. 2025:155(2);0091-674,  doi: 10.1016/j.jaci.2024.12.354
  3. Burke, William. (2014). The Ionic Composition of Nasal Fluid and Its Function. Health. 06. 720-728. 10.4236/health.2014.68093.
  4. Liu, C.M., Erikstrup, L.T., Edslev, S.M. et al. Composition and dynamics of the adult nasal microbiome. Microbiome 14, 38 (2026). https://doi.org/10.1186/s40168-025-02250-3
  5. Bachert, C., Luong, A. U., Gevaert, P., Mullol, J., Smith, S. G., Silver, J., Sousa, A. R., Howarth, P. H., Benson, V. S., Mayer, B., Chan, R. H., & Busse, W. W. (2023). The Unified Airway Hypothesis: Evidence From Specific Intervention With Anti-IL-5 Biologic Therapy. The journal of allergy and clinical immunology. In practice, 11(9), 2630–2641. https://doi.org/10.1016/j.jaip.2023.05.011
  6. Califf R. M. (2018). Biomarker definitions and their applications. Experimental biology and medicine (Maywood, N.J.), 243(3), 213–221. https://doi.org/10.1177/1535370217750088
  7. Rebuli, M. E., Stanley Lee, A., Nurhussien, L., Tahir, U. A., Sun, W. Y., Kimple, A. J., Ebert, C. S., Jr, Almond, M., Jaspers, I., & Rice, M. B. (2023). Nasal biomarkers of immune function differ based on smoking and respiratory disease status. Physiological reports, 11(3), e15528. https://doi.org/10.14814/phy2.15528
  8. Rebuli ME, Stanley Lee A, Nurhussien L, et al. Nasal biomarkers of immune function differ based on smoking and respiratory disease status. Physiological Reports. 2023 Feb;11(3):e15528. DOI: 10.14814/phy2.15528. PMID: 36780897; PMCID: PMC9925276.
  9. Hansel T. et al. A Comprehensive Evaluation of Nasal and Bronchial Cytokines and Chemokines Following Experimental Rhinovirus Infection in Allergic Asthma: Increased Interferons (IFN-γ and IFN-λ) and Type 2 Inflammation (IL-5 and IL-13). eBioMedicine. 19;128 - 138
  10. Busse, W. W., Holgate, S. T., Wenzel, S. W., Klekotka, P., Chon, Y., Feng, J., Ingenito, E. P., & Nirula, A. (2015). Biomarker Profiles in Asthma With High vs Low Airway Reversibility and Poor Disease Control. Chest, 148(6), 1489–1496. https://doi.org/10.1378/chest.14-2457
  11. Gu, K. M., Lee, T., & Myong, J. P. (2025). Wildfire Exposure and Respiratory Health: A Comprehensive Review of Emerging Evidence. Tuberculosis and respiratory diseases, 88(4), 643–653. https://doi.org/10.4046/trd.2025.0064
  12. Jung, D.H., Son, G., Wang, S.M. et al. Nasal Aβ42 mirrors brain amyloid dynamics and cognitive decline across the Alzheimer’s disease continuum. Sci Rep 15, 30413 (2025). https://doi.org/10.1038/s41598-025-15230-2
  13. Riechelmann, H., Deutschle, T., Rozsasi, A., Keck, T., Polzehl, D. and Bürner, H. (2005), Nasal biomarker profiles in acute and chronic rhinosinusitis. Clinical & Experimental Allergy, 35: 1186-1191. https://doi.org/10.1111/j.1365-2222.2005.02316.x

‍

‍

About Diag-Nose.io

Diag-Nose.io, founded in 2020, is a TechBio company focused on translating the complexities of the unified airway into precision diagnostic and drug discovery solutions.

Their precision medicine technology combines advanced proteomics, computational biology, and AI (machine learning) to create a scalable respiratory biology model. This innovation aims to help clinicians prescribe the right treatments faster and enable researchers to accelerate the development of new therapies.

The company’s flagship platform, RhinoMAP™, leverages proteomic data to predict respiratory disease activity, monitor therapy response and predict treatment efficacy in advance, with an initial focus on anti-Th2 biologics.

Learn more at Diag-Nose.io

About the author

Beth Wright

Junior Researcher

Beth Wright, a Junior Researcher at Diag-Nose, expertly aims to improve accessibility of medical information and research in the field of Respiratory Disease.

Beth holds a BBiomedSc. from Monash University.

‍

Updated: Tuesday 3 March, 20266 | Read Time: 6 mins

‍Beth Wright

‍

Your snot is more than just a nuisance - it is a diagnostic powerhouse

Far from being just a nuisance caused by colds, hayfever, or changing weather, your snot - or nasal fluid - is emerging as one of the most information-rich indicators of respiratory health [1,2].

Nasal fluid is now being recognised as a powerful window into respiratory immunity, infection, chronic disease, and even conditions beyond the airways.

‍

More than mucus: why our bodies make nasal fluid

Despite its appearance, nasal fluid really is much more than just watery, sticky dust trapped in your nose.

Of course, it is composed of 90% water - but it is also packed with proteins, lipids, metabolites, immune molecules, and microorganisms [3,4].

Although its role in defence is well-known - trapping pollutants, pathogens, and keeping the airway lining protected - emerging research shows nasal fluid does far more than defend; it communicates.

Your nasal fluid is a mirror.

We now understand that your snot reflects how your airways respond to the environment, infection, inflammation, and even long-term disease. This connection between the nose, lungs, and lower airways is even described by the increasingly well-known Unified Airway Concept, which recognises that the parts making up the respiratory system does not act in isolation but is a single, interconnected biological network [5].

‍

How exactly does nasal fluid reflect the body?

Nasal fluid contains tiny molecular signals called ‘biomarkers’.

These biomarkers are anything from proteins, genes, lipids or metabolites. They are highly dynamic and change in response to biological processes and conditions. So, when the body is being affected by disease these signals can be altered. These changes can then be measured, sometimes even before physical symptoms of disease occur [6].

Biomarkers allow scientists and clinicians to detect disease, distinguish subtypes, predict progression, tailor treatments, and monitor responses to therapy.

Research into nasal fluid biomarkers is rapidly progressing, opening the door to earlier (even less invasive) diagnosis, personalised treatment - ultimately new ways of listening and responding to diseases in the human body [7].

‍

Why nasal fluid is emerging as a powerful diagnostic medium

For decades, blood has dominated the diagnostic landscape. But increasingly, researchers are turning their attention to a far more accessible - and perhaps more relevant - source of insight: nasal fluid.

Collecting nasal fluid is simple, quick and minimally invasive.

It doesn’t require the technical expertise of a biopsy or the infrastructure of more complex procedures. And when it comes to respiratory disease, it offers something blood often can’t - a direct window into the airway itself [8]

The nasal lining is the airway’s frontline.

It’s the first point of contact for viruses, allergens, pollutants and environmental triggers. Sampling this environment means capturing biological signals at the site where many respiratory diseases actually begin. Inflammation, infection and immune dysfunction can often be detected here earlier and more precisely than through systemic samples.

What makes nasal fluid even more compelling is that it doesn’t just reflect local airway health. The immune system is intrinsically interconnected. Signals detected in the nasal passage can mirror broader inflammatory and immune pathways across the body - offering potential insights into systemic and even neurological conditions [9].

In other words, nasal fluid isn’t just convenient. It’s biologically strategic.

Who would’ve thought?

‍

From asthma to infection: what else can nasal fluid reveal?

Nasal fluid is showing exciting promise in asthma research.

For instance, certain inflammatory proteins are significantly elevated in people with asthma, while others may decrease. Intriguingly, management of disease can also affect these biomarker profiles.

People with poorly controlled asthma show different nasal biomarker profiles compared to those whose disease is well managed [10].

This is only the beginning.

Scientists, including the team at Diag-Nose, are still investigating the hundreds of biomarkers present in nasal secretions.

We now know that nasal fluid can also help distinguish bacterial versus viral infections, CRS with or without nasal polyps, exposure to air pollution and smoke, some cancers, neurodegenerative diseases, and mood disorders [11-13].

This differentiation can greatly improve patient outcomes as treatment strategies differ even between subtypes. For instance, some subtypes respond well to targeted biologic therapies, while others require different approaches.

‍

Beyond the airways: can nasal fluid reflect brain health?

It might sound surprising, but nasal fluid can actually offer clues about diseases outside of the lungs - going as far as the brain.

In Alzheimer’s disease, toxic proteins such as amyloid-β and tau accumulate years before symptoms appear [10].

Researchers have now detected these biomarkers in nasal fluid, raising the possibility of simple, non-invasive screening for neurodegenerative disease - potentially years earlier than current methods allow.

‍

‍

Decoding your body through your nose

Every sniffle, drip, or runny nose carries data.

Let’s put it this way - nasal fluid is less of an inconvenience and more of a microscopic logbook - quietly tracking your immune system, environmental exposures, disease signals, often before you feel a thing.

As researchers get better at decoding these molecular messages, nasal fluid is reshaping diagnostics - shifting from reactive testing to earlier, smarter detection.

So next time you reach for a tissue, consider that it’s not just a nuisance - it’s a real-time readout of your biology, telling the story of your health in ways we’re only just beginning to understand.

‍

‍

References

  1. Chen M, Ge Y, Zhang W, Wu P, Cao C. Nasal Lavage Fluid Proteomics Reveals Potential Biomarkers of Asthma Associated with Disease Control. J Asthma Allergy. 2024 May 16;17:449-462. doi: 10.2147/JAA.S461138. PMID: 38770268; PMCID: PMC11104442.
  2. Rosado-Alicea J, Morton S, Brown A, Akenroye A et al. Mass Spectrometric Analysis of Nasal Fluid Proteomics Reveals Differentially Expressed Proteins in Allergic Asthmatics, Journal of Allergy and Clinical Immunology. AB111. 2025:155(2);0091-674,  doi: 10.1016/j.jaci.2024.12.354
  3. Burke, William. (2014). The Ionic Composition of Nasal Fluid and Its Function. Health. 06. 720-728. 10.4236/health.2014.68093.
  4. Liu, C.M., Erikstrup, L.T., Edslev, S.M. et al. Composition and dynamics of the adult nasal microbiome. Microbiome 14, 38 (2026). https://doi.org/10.1186/s40168-025-02250-3
  5. Bachert, C., Luong, A. U., Gevaert, P., Mullol, J., Smith, S. G., Silver, J., Sousa, A. R., Howarth, P. H., Benson, V. S., Mayer, B., Chan, R. H., & Busse, W. W. (2023). The Unified Airway Hypothesis: Evidence From Specific Intervention With Anti-IL-5 Biologic Therapy. The journal of allergy and clinical immunology. In practice, 11(9), 2630–2641. https://doi.org/10.1016/j.jaip.2023.05.011
  6. Califf R. M. (2018). Biomarker definitions and their applications. Experimental biology and medicine (Maywood, N.J.), 243(3), 213–221. https://doi.org/10.1177/1535370217750088
  7. Rebuli, M. E., Stanley Lee, A., Nurhussien, L., Tahir, U. A., Sun, W. Y., Kimple, A. J., Ebert, C. S., Jr, Almond, M., Jaspers, I., & Rice, M. B. (2023). Nasal biomarkers of immune function differ based on smoking and respiratory disease status. Physiological reports, 11(3), e15528. https://doi.org/10.14814/phy2.15528
  8. Rebuli ME, Stanley Lee A, Nurhussien L, et al. Nasal biomarkers of immune function differ based on smoking and respiratory disease status. Physiological Reports. 2023 Feb;11(3):e15528. DOI: 10.14814/phy2.15528. PMID: 36780897; PMCID: PMC9925276.
  9. Hansel T. et al. A Comprehensive Evaluation of Nasal and Bronchial Cytokines and Chemokines Following Experimental Rhinovirus Infection in Allergic Asthma: Increased Interferons (IFN-γ and IFN-λ) and Type 2 Inflammation (IL-5 and IL-13). eBioMedicine. 19;128 - 138
  10. Busse, W. W., Holgate, S. T., Wenzel, S. W., Klekotka, P., Chon, Y., Feng, J., Ingenito, E. P., & Nirula, A. (2015). Biomarker Profiles in Asthma With High vs Low Airway Reversibility and Poor Disease Control. Chest, 148(6), 1489–1496. https://doi.org/10.1378/chest.14-2457
  11. Gu, K. M., Lee, T., & Myong, J. P. (2025). Wildfire Exposure and Respiratory Health: A Comprehensive Review of Emerging Evidence. Tuberculosis and respiratory diseases, 88(4), 643–653. https://doi.org/10.4046/trd.2025.0064
  12. Jung, D.H., Son, G., Wang, S.M. et al. Nasal Aβ42 mirrors brain amyloid dynamics and cognitive decline across the Alzheimer’s disease continuum. Sci Rep 15, 30413 (2025). https://doi.org/10.1038/s41598-025-15230-2
  13. Riechelmann, H., Deutschle, T., Rozsasi, A., Keck, T., Polzehl, D. and Bürner, H. (2005), Nasal biomarker profiles in acute and chronic rhinosinusitis. Clinical & Experimental Allergy, 35: 1186-1191. https://doi.org/10.1111/j.1365-2222.2005.02316.x

‍

‍

About Diag-Nose.io

Diag-Nose.io, founded in 2020, is a TechBio company focused on translating the complexities of the unified airway into precision diagnostic and drug discovery solutions.

Their precision medicine technology combines advanced proteomics, computational biology, and AI (machine learning) to create a scalable respiratory biology model. This innovation aims to help clinicians prescribe the right treatments faster and enable researchers to accelerate the development of new therapies.

The company’s flagship platform, RhinoMAP™, leverages proteomic data to predict respiratory disease activity, monitor therapy response and predict treatment efficacy in advance, with an initial focus on anti-Th2 biologics.

Learn more at Diag-Nose.io

About the author

Beth Wright

Junior Researcher

Beth Wright, a Junior Researcher at Diag-Nose, expertly aims to improve accessibility of medical information and research in the field of Respiratory Disease.

Beth holds a BBiomedSc. from Monash University.

‍