A salt water gargle is a cheap, simple way to soothe a sore or scratchy throat for a while. Mayo Clinic recommends it for sore throats from colds, and its recipe is easy: 1/4 to 1/2 teaspoon of salt in an 8-ounce glass of warm water.
It won’t treat the allergy itself, but it can ease the throat irritation that comes with postnasal drip from hay fever or a cold. This guide covers the recipe, what the research shows, who shouldn’t gargle, and when a sore throat needs a doctor. For more relief options, see our allergy treatment guides.
Jump to: Quick answer · Recipe and how to gargle · Why allergies cause a sore throat · What the evidence shows · When to see a doctor · FAQ
Quick answer
- Recipe: 1/4 to 1/2 teaspoon of salt in an 8-ounce glass of warm water (Mayo Clinic).
- What it does: relieves a sore throat for a while. It doesn’t cure a cold or stop an allergy.
- Kids: Mayo Clinic notes children younger than 6 most likely can’t gargle.
- Research: in a Japanese trial, people who gargled plain water three times a day had fewer colds over 60 days than people who didn’t gargle.
- For a stuffy nose: a saline nose rinse or spray works better than gargling.
How to make and use a salt water gargle
- Mix it. Stir 1/4 to 1/2 teaspoon of table salt into an 8-ounce (about 240 mL) glass of warm, not hot, water until it dissolves.
- Gargle. Take a sip, tilt your head back and gargle for several seconds.
- Spit it out. Don’t swallow it.
- Repeat until the glass is used up, and gargle again later in the day as needed.
If you have been told to strictly limit sodium, ask your doctor whether salt water gargles are OK for you.
Other quick throat soothers
Mayo Clinic also suggests ice chips, sore throat sprays, lozenges or hard candy. Don’t give lozenges or hard candy to children younger than 6, who can choke on them. A cool-mist humidifier can help with stuffiness if you change the water daily and clean the unit as the maker instructs; see humidifiers and flu.
Why allergies can give you a sore throat
Mayo Clinic lists allergies as a risk factor: people with seasonal allergies or other allergic reactions are more likely to get a sore throat. Mucus running down the back of the throat (postnasal drip), which is common with hay fever and dust mite allergy, can leave the throat scratchy and make you cough.
A salt water gargle can ease that irritation, but treating the allergy helps more:
- Rinse your nose. Saline nasal drops and sprays can relieve stuffiness (Mayo Clinic), and the National Center for Complementary and Integrative Health says there is some good evidence that saline nasal rinses help seasonal allergy symptoms. Use distilled, sterile, or boiled and cooled water for rinses; see our neti pot guide.
- Cut your exposure to pollen or dust mites; see our pollen avoidance guide and dust mite allergy guide.
- Ask about allergy medicine, such as antihistamines or steroid nose sprays.
What the evidence shows
There isn’t much research on gargling for allergies specifically. The best-known study is about colds:
- Japanese gargling trial (2005): 387 healthy adults were assigned to gargle with plain water, gargle with a povidone-iodine solution, or do nothing, during winter. Over 60 days, the water-gargling group had fewer first colds and other upper respiratory infections than the control group; the iodine group did not do significantly better than controls. When people in the water group did get sick, bronchial symptoms tended to be milder.
That study used plain water, not salt water, and only looked at preventing colds. For sore throats, Mayo Clinic’s advice is simply that a saltwater gargle can relieve one for a while.
When to see a doctor for a sore throat
Mayo Clinic, citing the American Academy of Otolaryngology, advises adults to see a healthcare professional for a sore throat with any of these:
- A bad sore throat that lasts longer than a week.
- Not being able to swallow, trouble breathing, or trouble opening the mouth.
- Fever higher than 101°F (38.3°C), a rash, joint pain or earache.
- Bloody mucus, repeated sore throats, or a lump in the neck.
- Hoarseness that lasts more than two weeks, or swelling in the neck or face.
For children, Mayo Clinic, citing the American Academy of Pediatrics, says to see a healthcare professional if the sore throat doesn’t go away after a drink in the morning, and to get immediate care for trouble breathing, not being able to swallow, or unusual drooling.
This guide is general information, not medical advice. Read our medical disclaimer.
Frequently asked questions
Does salt water gargle help allergies?
It can ease a scratchy throat from postnasal drip, but it doesn’t treat the allergy. Saline nose rinses, avoiding your triggers and allergy medicines do more for the allergy itself.
How much salt do I put in a salt water gargle?
Mayo Clinic recommends 1/4 to 1/2 teaspoon of salt in an 8-ounce glass of warm water.
How often can I gargle with salt water?
Mayo Clinic doesn’t give a set number. In the Japanese cold-prevention study, participants gargled at least three times a day. If your sore throat lasts more than a week, see a doctor.
Does gargling help postnasal drip?
It can soothe the throat irritation that postnasal drip causes. To reduce the drip itself, try a saline nose rinse and treat the allergy or cold behind it.
Can children gargle with salt water?
Mayo Clinic notes children younger than 6 most likely can’t gargle. Older children can try it if they can spit it out reliably.
Sources
- Mayo Clinic Staff. Cold remedies: What works, what doesn’t, what can’t hurt. July 12, 2024.
- Mayo Clinic Staff. Sore throat: Symptoms and causes. April 12, 2025.
- Satomura K, Kitamura T, Kawamura T, et al. Prevention of upper respiratory tract infections by gargling: a randomized trial. Am J Prev Med. 2005;29(4):302-307.
- National Center for Complementary and Integrative Health. Things to know about complementary health approaches for seasonal allergy relief.
- Mayo Clinic Staff. Dust mite allergy: Symptoms and causes (postnasal drip).
Last reviewed: October 21, 2026.
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