From reducing viral load to easing long COVID sinus symptoms - the latest science on nasal irrigation and COVID-19 recovery.
Key Finding: A 2025 study found that regular nasal irrigation decreased COVID-19 viral load by 8.9% in hospitalized patients. Multiple studies also show nasal rinsing reduces the duration and severity of respiratory viral infections, including COVID-19.
The 2025 COVID Nasal Irrigation Study
One of the most significant recent findings in nasal health research comes from a 2025 study published in PLOS ONE examining the effect of nasal irrigation on COVID-19 patients. The study found that patients who performed regular nasal irrigation had measurably lower viral loads in their nasal passages compared to those who did not rinse.
PLOS ONE Study (2025): Regular nasal irrigation decreased COVID-19 viral load by 8.9% in hospitalized patients. The researchers concluded that nasal irrigation may help reduce viral shedding and potentially lower transmission risk.
Source: PLOS ONE, "Effect of Nasal Irrigation on SARS-CoV-2 Viral Load," 2025
Laryngoscope Study (2021, expanded 2024): COVID-19 patients who began twice-daily nasal irrigation within 24 hours of diagnosis were 8.06 times less likely to be hospitalized compared to the national average at the time. They also recovered faster and had lower rates of symptom progression.
Source: The Laryngoscope, "Rapid initiation of nasal saline irrigation to reduce severity in high-risk COVID+ outpatients," 2021 / updated analysis 2024
Why Nasal Rinsing Works Against Respiratory Viruses
8.9%
Reduction in COVID viral load with regular nasal irrigation (2025 study)
8x
Lower hospitalization rate for COVID patients who started nasal rinsing early (2021 Laryngoscope)
2 days
Shorter cold duration with nasal saline irrigation (2024 Lancet, 11,000+ participants)
The mechanism is straightforward: respiratory viruses including SARS-CoV-2 replicate primarily in the nasal passages before spreading to the lower respiratory tract. Nasal irrigation physically flushes viral particles, inflammatory debris, and mucus from the nasal cavity, reducing the viral burden and giving the immune system a better chance to contain the infection.
Additionally, saline solution creates a slightly hypertonic environment that is inhospitable to viral replication, and the baking soda in ATO Health Sinus Rinse packets helps restore the natural pH of nasal mucus, which supports the function of cilia - the tiny hair-like structures that sweep pathogens out of the nasal passages.
Long COVID and Sinus Symptoms
Long COVID - the persistence of symptoms weeks or months after acute infection - frequently includes nasal and sinus symptoms. According to data from the CDC and multiple post-COVID studies, the most common long COVID nasal symptoms include:
Persistent nasal congestion - often described as a feeling of fullness or blockage that does not resolve
Post-nasal drip - excess mucus draining down the back of the throat, causing chronic cough
Loss of smell (anosmia) or distorted smell (parosmia) - affecting an estimated 5-15% of long COVID patients
Sinus pressure and headaches - often worse in the morning
Increased sensitivity to allergens - some long COVID patients develop new or worsened allergies
ENT specialists and post-COVID clinics increasingly recommend nasal irrigation as a first-line treatment for these symptoms. The physical flushing action removes inflammatory debris and residual viral proteins that may be perpetuating the immune response in the nasal passages.
How to Use Nasal Rinsing During and After COVID
During Active COVID Infection
You can begin nasal rinsing as soon as you feel comfortable doing so - even during active COVID infection. Start with once daily and increase to twice daily if tolerated. Use lukewarm distilled or sterile water with an ATO Health Sinus Rinse packet. Rinse over a sink and dispose of used solution carefully.
During Recovery (First 2-4 Weeks After Testing Negative)
Continue twice-daily rinsing to help clear residual mucus and inflammatory debris. Many people find that nasal congestion and post-nasal drip persist for 2-4 weeks after the acute infection resolves - regular rinsing can significantly speed this process.
For Long COVID Sinus Symptoms (4+ Weeks)
If you are experiencing persistent sinus symptoms months after COVID, establish a regular nasal rinsing routine of once or twice daily. Consistency is key - the benefits of nasal irrigation accumulate over time, with the 2025 nasal microbiome study showing that regular rinsing modulates the nasal microbiota in ways that reduce chronic inflammation.
Frequently Asked Questions
Q: Does nasal rinsing help with COVID symptoms?
Yes. A 2025 study found that regular nasal irrigation decreased COVID-19 viral load by 8.9% in hospitalized patients. Multiple studies also show nasal rinsing reduces symptom duration and severity in respiratory viral infections, including COVID-19.
Q: Can nasal rinsing help with long COVID sinus symptoms?
Many long COVID patients report persistent nasal congestion, post-nasal drip, and sinus pressure. Nasal irrigation can provide significant relief for these symptoms by physically clearing mucus and inflammatory debris from the nasal passages. ENT specialists frequently recommend it as a first-line treatment for post-COVID nasal symptoms.
Q: When can I start nasal rinsing after having COVID?
You can begin nasal rinsing as soon as you feel comfortable doing so - even during active COVID infection. Some studies suggest starting early may help reduce viral load and symptom duration. If you have severe nasal inflammation or pain, wait until acute symptoms subside and consult your doctor.
Q: Will nasal rinsing help me regain my sense of smell after COVID?
Nasal irrigation may help support smell recovery by clearing inflammatory debris from the olfactory region of the nasal passages. While it is not a guaranteed treatment for COVID-related anosmia, many ENT specialists include it as part of a comprehensive smell rehabilitation protocol alongside olfactory training.
Q: Is it safe to use a neti pot if I currently have COVID?
Yes, it is safe. Nasal rinsing does not worsen COVID infection and may help reduce viral load in the nasal passages. Use distilled or sterile water, rinse the device thoroughly after each use, and do not share your neti pot with other household members.
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