New Research Confirms Ancient Nasal Rinse Fights Common Cold

The common cold is a familiar adversary that most people face several times each year. It often begins with a subtle irritation at the back of the throat, followed by sneezing, coughing, and congestion that can last for up to nine days. While these symptoms are typically manageable, they can be frustrating and uncomfortable. Unlike bacterial infections, colds do not respond to antibiotics, and over-the-counter medications often provide only limited relief.

In recent years, a growing body of research has highlighted the benefits of an ancient practice known as nasal saline irrigation. This technique has been shown to be effective in reducing the duration of colds and minimizing the spread of viruses to others. It also helps reduce the need for antibiotics and may even lower the risk of hospitalization in some cases. What makes this method particularly appealing is its affordability and accessibility—costing just a few cents and requiring no prescription.

As both an adjunct assistant professor of medicine and a practicing physician, I encounter the common cold on a daily basis. Many of my patients are initially skeptical when I recommend nasal saline irrigation. However, they often return to share how this simple practice has made a significant difference in their lives. Beyond treating colds, it also helps manage allergies, chronic nasal congestion, postnasal drip, and recurrent sinus infections.

What is Nasal Saline Irrigation?

Nasal saline irrigation involves rinsing the nasal cavity with a saltwater solution. This process can be carried out using various tools. Some studies have used pump-action spray bottles, while others have employed traditional neti pots, which resemble small teapots. The neti pot has its roots in the Ayurvedic tradition, an ancient system of medicine from India that dates back more than 5,000 years.

The use of neti pots can be traced back to the 15th century. In the United States, it gained mainstream attention in 2012 after Dr. Oz demonstrated it on the "Oprah Winfrey Show." However, the neti pot is not the only device used for nasal irrigation. Ancient Greek and Roman physicians also had their own nasal lavage devices. These practices were even discussed in medical journals such as The Lancet over a century ago, as early as 1902.

Benefits of Nasal Saline Irrigation

There are several advantages to incorporating nasal saline irrigation into your routine:

• Reduces the duration of illness: Studies have shown that regular use of nasal irrigation can shorten the time it takes to recover from a cold.
• Minimizes viral transmission: By clearing mucus and reducing viral load, this practice can help prevent the spread of infection to others.
• Lowers antibiotic use: Since nasal irrigation addresses the root cause of congestion and inflammation, it can reduce the need for antibiotics.
• Improves overall nasal health: Regular use can help manage chronic conditions like allergies, sinusitis, and postnasal drip.

How does nasal saline irrigation work?

Nasal saline has a few key benefits. First, it physically flushes debris out of the nasal passage. This not only includes mucus and crust, but also the virus itself, along with allergens and other environmental contaminants.

Second, salt water is slightly lower on the pH scale compared with fresh water. Its acidity creates an environment that is inhospitable for viruses and makes it harder for them to replicate.

Third, nasal saline helps restore the actions of part of our natural defense system, which is composed of microscopic, hairlike projections called cilia that line the surface of the nasal passage. These cilia beat in a coordinated fashion to act like an escalator, propelling viruses and other foreign particles out of the body. Nasal saline irrigation helps keep this system running effectively.

What the research shows

A study of more than 11,000 people published in The Lancet in 2024 demonstrated that nasal saline irrigation, initiated at the first sign of symptoms and performed up to six times per day, reduced the duration of symptomatic illness by approximately two days. Meanwhile, smaller studies have reported that the reduced duration of illness could be as high as four days.

Research has also demonstrated that nasal saline irrigation can help prevent the spread of illness. A study in hospitalized patients showed that after detection of COVID-19 via nasal swab, nasal saline irrigation performed every four hours over a 16-hour period decreased COVID-19 viral load by 8.9%. Meanwhile, the viral load in the control group continued to increase during that time.

The benefits of nasal saline also extend beyond acute infectious illnesses. When performed regularly by patients with allergic rhinitis, also known as hay fever, a meta-analysis of 10 randomized controlled trials showed that nasal saline irrigation can enable a 62% reduction in the use of allergy medications. It’s also effective for chronic congestion, postnasal drip and recurrent sinus infections.

Why it matters

Besides helping patients feel better faster, one of the most valuable benefits of nasal saline irrigation is that its use can help decrease unnecessary antibiotic prescriptions, which are a major contributor to antibiotic resistance.

It is well established that antibiotics do not shorten the duration or reduce the severity of respiratory tract infections. Despite this, studies have shown that patients are happier when they leave their doctor’s office with an antibiotic prescription in hand.

This may be why 10 million inappropriate antibiotic prescriptions are given each year for viral respiratory tract infections. In one study of more than 49,000 patient encounters for respiratory infections, antibiotics were unnecessarily prescribed to 42.4% of patients.

One reason patients with upper respiratory viral infections tend to initially feel better with antibiotics is because of their off-target, anti-inflammatory properties. However, this benefit can be better achieved with anti-inflammatory medications such as ibuprofen or naproxen, that can be taken in conjunction with nasal saline irrigation.

Overall, nasal saline irrigation is a cheap, effective, evidence-based alternative that will not only shorten the duration of illness but also prevent its spread, minimize the need for unnecessary antibiotics and keep people out of the hospital.

How to do it

Irrigating your nasal passages as soon as you feel the first signs of illness is proven to reduce the duration and severity of the common cold.

For those who want to try it, you don’t need anything fancy. Even a neti pot is not necessary. Many pharmacies sell salt water in a container with a nozzle and even spray bottles that can be refilled with a homemade saltwater solution.

You’ll mix approximately half a teaspoon of non-iodized salt with 1 cup of water. It’s important for your safety that the water be either distilled water or boiled for at least five minutes and then cooled to destroy any harmful bacteria. You can also add a pinch of baking soda to reduce any potential sting.

Note that saltier solutions are not more effective. However, some studies have suggested natural seawater, due to its additional minerals such as magnesium, potassium and calcium, could offer even greater benefits. Saltwater solutions can also be purchased commercially, which might be worth a try for those with an insufficient response to saline alone.

You can use nasal saline irrigation after any potential exposure to an infectious illness. For best results, you’ll want to start irrigating the nasal passage at the first sign of an infection. You can repeat rinses throughout the day as often as needed for the duration of the illness. At minimum, you’ll want to irrigate the nasal passages every morning and evening. You can also consider gargling salt water as an adjunctive therapy.

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How to Perform Nasal Saline Irrigation

To perform nasal saline irrigation, you will need a saline solution and a suitable device. Here are the steps:

1. Prepare a saline solution by mixing distilled or boiled water with non-iodized salt. You can also purchase pre-made solutions from pharmacies.
2. Use a neti pot, squeeze bottle, or other nasal irrigation device to pour the solution into one nostril.
3. Allow the solution to drain out of the other nostril.
4. Repeat the process on the other side.
5. Afterward, gently blow your nose to clear any remaining mucus.

It is important to use clean, sterile equipment and to follow proper hygiene practices to avoid infections. Always consult with a healthcare provider before starting any new treatment, especially if you have underlying health conditions.

Conclusion

Nasal saline irrigation is a safe, effective, and affordable way to manage the common cold and other nasal conditions. With its long history and growing scientific support, it is becoming an increasingly popular choice among patients and healthcare professionals alike. Whether you are dealing with a cold, allergies, or chronic congestion, this simple practice could make a big difference in your quality of life.