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Saline Nasal Rinse for a Blocked Nose: How to Do It Safely

Rinsing your nose with salt water can ease congestion from colds, allergies and sinus problems. Here is what the research shows, how to rinse, and the water rule you must not skip.

Edited by Anmar ArabPublished 13 October 2026, 6 min read
On this page
  1. Quick answer
  2. What the research says
  3. How to use it
  4. Possible side effects and interactions
  5. Who should be careful
  6. When to see a doctor
  7. Frequently asked questions

Quick answer

A saline nasal rinse means washing the inside of your nose with a mild salt-water solution, using a neti pot, a squeeze bottle or a bulb syringe. It flushes out mucus, pollen and dust and adds moisture, which is why many people find it eases a stuffy nose.

The evidence is reasonable but not perfect. Reviews suggest rinsing can improve symptoms of allergic rhinitis (hay fever) and long-lasting sinus problems in adults. For an ordinary cold, any benefit appears small. Side effects are usually minor, such as brief stinging.

The one rule that really matters: never use water straight from the tap. Use distilled or sterile water, or tap water that has been boiled and cooled. Untreated tap water can, very rarely, carry organisms that cause serious and even fatal infections when they get into the nose.

What the research says

Colds and other short-term infections. A Cochrane review (King and colleagues, 2015) looked at five randomised trials with 749 participants, mostly children. Most outcomes showed no clear difference between saline and usual care. In the largest trial, 401 children aged 6 to 10 who used saline had slightly less nasal discharge and blockage and used fewer decongestant medicines. In adults, symptoms cleared a little faster, but the difference was not considered clinically meaningful. The reviewers rated the evidence as low quality and said saline "possibly has benefits", with only minor irritation reported.

Allergic rhinitis. A second Cochrane review (Head and colleagues, 2018) pooled 14 trials with 747 adults and children. Compared with no saline, rinsing may improve symptoms for up to three months, in both age groups. However, the certainty was low or very low because the studies were small and used different scoring systems. It is unclear whether adding saline to steroid sprays or antihistamines brings extra benefit.

Chronic sinusitis and choosing a method. A 2022 systematic review in OTO Open (Chitsuthipakorn and colleagues) examined 69 studies, including 59 randomised trials. It concluded that saline is recommended for most nose and sinus conditions, with the method matched to the problem:

  • For adults with allergies or chronic sinusitis, larger volumes (about 60 ml or more per rinse, as with a squeeze bottle or neti pot) were generally favoured over small-volume sprays or syringes.
  • For chronic sinusitis, adults were advised to rinse for at least four weeks, ideally with buffered saline (with a little baking soda added). Buffered isotonic saline, which has the same salt strength as body fluids, was the best tolerated.
  • Stronger (hypertonic) salt solutions sometimes helped symptoms more but caused more burning, so the authors suggest trying isotonic saline first.

Overall, the rating here is moderate: the evidence generally points towards benefit for allergies and long-lasting sinus problems, and the method is low risk, but most trials are small and the effect on ordinary colds is minor.

How to use it

What you need. A neti pot, squeeze bottle or rubber bulb syringe, plus either a ready-made saline solution or salt mix sold for nasal rinsing, or a homemade solution. If your kit comes with its own salt mix, follow its directions.

Homemade solution. MedlinePlus (the US National Library of Medicine) gives this recipe:

  • 1 teaspoon (about 5 g) of non-iodised salt, such as canning or pickling salt
  • A pinch of baking soda
  • 2 cups (about 0.5 litres) of warm distilled, filtered or boiled water

If it stings, use a little less salt.

Making the water safe. The US Food and Drug Administration (FDA) advises using water labelled "distilled" or "sterile", or tap water boiled for 3 to 5 minutes and then cooled to lukewarm. Boiled water can be kept in a clean, closed container and used within 24 hours. Filtered water is only suitable if the filter is designed to trap infectious organisms.

Never rinse your nose with untreated tap water. Germs that stomach acid would normally kill can survive in the nose and, in rare cases, cause life-threatening infections. Use distilled, sterile, or boiled and cooled water, and keep the device clean and dry.

Rinsing step by step.

  1. Wash your hands and check the device is clean and dry.
  2. Lean over a sink or stand in the shower. Tilt your head to one side, keeping your chin and forehead roughly level, and breathe through your mouth.
  3. Gently pour or squeeze about half the solution into your upper nostril. It should drain out of the lower nostril.
  4. Adjust your head angle if the liquid runs into your throat or ears.
  5. Gently blow your nose, then repeat on the other side.
  6. Wash the device, dry it with a paper towel or let it air dry.

Timing. If you also use a medicated nasal spray, MedlinePlus suggests rinsing first so the spray can reach the lining of the nose. Follow the instructions supplied with your kit, or your doctor's advice, on how often to rinse. Expect it to take a few attempts before it feels comfortable.

Possible side effects and interactions

Saline rinsing is generally considered safe. Reported side effects include:

  • Mild stinging or burning, especially at first or with stronger salt solutions
  • Dryness or irritation inside the nose
  • A feeling of fullness or discomfort in the ears
  • Occasional minor nosebleeds

Stinging often eases if you use slightly less salt, and the 2022 review found isotonic (weaker) solutions caused less irritation than stronger ones.

The main serious risk comes from contaminated water or a dirty device, not from the salt. This is why the water rule and regular cleaning matter so much.

Who should be careful

  • People with a weakened immune system should talk to a doctor before using any nasal irrigation device, as the FDA advises.
  • Children can sometimes use nasal rinses, but the FDA recommends asking a doctor first. Very young children often cannot tolerate the procedure, and the review evidence for children mostly supports smaller volumes or drops.
  • Anyone whose nose is completely blocked should not rinse until it opens up a little, as MedlinePlus advises.
  • People with recent nose or sinus surgery, or frequent nosebleeds, should follow their specialist's instructions.

When to see a doctor

See a doctor if:

  • Your symptoms last longer than 10 to 14 days, or a cold gets worse after about 7 days
  • You have a fever
  • You develop a severe headache that over-the-counter painkillers do not relieve
  • You notice any change in your vision during a sinus infection
  • You get nosebleeds, pain or headaches while using a nasal rinse
  • Your symptoms do not improve, or get worse, after rinsing

Rinsing can make you more comfortable, but it does not replace medical assessment if something feels wrong.

Frequently asked questions

Can I use tap water if it is safe to drink?

US health authorities advise against it. Drinking water is safe because stomach acid kills most germs, but the nose has no such protection. Boiling tap water for 3 to 5 minutes and letting it cool is a simple, cheap way to remove this rare but serious risk.

Is a neti pot better than a squeeze bottle?

Both deliver a large volume of saline, which the 2022 review found worked better than small sprays for adults with allergies or chronic sinusitis. Choose whichever you find easier and can keep clean.

Can I use ordinary table salt?

MedlinePlus recommends salt without iodine, such as canning or pickling salt, rather than ordinary iodised table salt. Ready-made salt mixes sold for nasal rinsing avoid the guesswork.

Does a saline rinse cure a sinus infection?

No. Most short-term sinus infections clear on their own, and rinsing may simply help you feel less blocked while that happens. If you have red-flag symptoms such as fever, severe headache or vision changes, see a doctor.

References

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