The fastest way to get phlegm out of your throat is to gargle warm salt water, stay well hydrated, and use a specific breathing technique called huff coughing that moves mucus up without straining your throat. Most phlegm from a cold or flu clears on its own within a week or two, but there are several things you can do right now to speed the process along and get relief.
Phlegm is a thick type of mucus produced in your lower respiratory tract, usually in response to an infection. It’s thicker than normal mucus because it’s actively trapping bacteria and viruses. Getting it out is your body’s way of clearing those invaders, so the goal isn’t to stop phlegm production entirely. It’s to thin it out and move it up more efficiently.
Salt Water Gargle
A warm salt water gargle is one of the simplest and most effective ways to loosen phlegm stuck in your throat. Dissolve at least a quarter teaspoon of salt in half a cup of warm water. This creates a solution with higher salt concentration than your throat tissue, which draws fluid (along with trapped viruses and bacteria) to the surface. Gargle for 15 to 30 seconds, spit it out, and repeat two or three times. You can do this several times a day.
The key is making sure the water is warm, not hot. Warm water helps dissolve the salt fully and soothes irritated tissue at the same time.
The Huff Cough Technique
Forceful, repeated coughing can irritate your throat and actually make phlegm production worse. A better approach is huff coughing, a technique that moves mucus from your smaller airways into your larger ones where it’s easier to clear. Think of it as the breath you’d use to fog up a mirror: smaller but more forceful exhales instead of big, hacking coughs.
Here’s how to do it:
- Take a slow, medium breath in through your nose (not a deep gasp through your mouth).
- Hold your breath for two to three seconds. This gets air behind the mucus.
- Exhale slowly but firmly through a slightly open mouth, like you’re fogging a window.
- Repeat one or two more times.
- Finish with one strong cough to push the loosened phlegm out of your larger airways.
One important detail: avoid breathing in quickly and deeply through your mouth right after coughing. Quick inhales can push mucus back down and trigger uncontrolled coughing fits.
Hydration and Humidity
Phlegm gets stickier and harder to clear when you’re dehydrated or breathing dry air. Drinking plenty of warm fluids throughout the day, like water, broth, or herbal tea, helps thin mucus so it moves more easily. Cold water works too, but warm liquids can feel more soothing on an irritated throat.
If you’re running a humidifier at home, keep indoor humidity between 30% and 50%. Below 30%, the dry air thickens airway secretions. Above 50%, you risk encouraging mold and dust mite growth, which can trigger more mucus production. A simple hygrometer (available for a few dollars at most hardware stores) lets you check your levels.
Honey for Cough and Throat Irritation
Honey coats and soothes the throat, and it performs better than you might expect. A systematic review from the University of Oxford found that honey was associated with a significantly greater reduction in cough severity and frequency compared to usual care, including over-the-counter cough syrups. You can take a spoonful straight, stir it into warm water, or mix it into tea. Avoid giving honey to children under one year old due to botulism risk.
Over-the-Counter Expectorants
If home remedies aren’t cutting it, an expectorant containing guaifenesin (the active ingredient in Mucinex and many store-brand versions) works by thinning the mucus in your lungs and airways so you can cough it up more easily. It doesn’t suppress coughing. It makes each cough more productive.
Standard short-acting tablets are typically taken every four hours, while extended-release versions last about twelve hours. Drink a full glass of water with each dose, since the medication needs adequate hydration to work properly. Avoid combination products that include a cough suppressant unless you specifically want to reduce coughing at night; suppressing the cough reflex during the day can trap phlegm in your airways longer.
Steam and Warm Liquids
Breathing in steam loosens phlegm quickly. You can stand in a hot shower for 10 to 15 minutes, drape a towel over your head and lean over a bowl of hot water, or simply hold a warm mug of tea close to your face and breathe in the vapor. The moist heat works on the same principle as a humidifier but delivers more concentrated moisture directly to your airways.
Combining steam with a salt water gargle afterward is particularly effective. The steam loosens the phlegm, and the gargle helps draw it out.
When Phlegm Won’t Go Away
If your phlegm persists for more than two weeks, or if it’s yellow, green, brown, black, or red, something beyond a typical cold is likely going on.
One commonly overlooked cause of chronic throat phlegm is silent reflux, also called laryngopharyngeal reflux. Unlike typical heartburn, silent reflux may not cause any burning sensation. Instead, small amounts of stomach acid reach your throat and interfere with the normal mechanisms that clear mucus. The result is a persistent feeling of phlegm that no amount of coughing seems to fix. Common dietary triggers include coffee, chocolate, alcohol, mint, garlic, and onions. Spicy and acidic foods also tend to make it worse. If your throat phlegm seems unrelated to a cold and gets worse after meals or when lying down, silent reflux is worth investigating.
Other causes of lingering phlegm include allergies, asthma, and chronic sinus drainage. Pink or frothy phlegm paired with shortness of breath, chest pain, or leg weakness can signal heart failure and needs immediate medical attention. Coughing up blood without phlegm also warrants an emergency visit.
What to Avoid
Certain habits can thicken phlegm or increase its production. Dairy doesn’t actually cause your body to make more mucus (that’s a persistent myth), but it can make existing phlegm feel thicker and more coating in your throat. Caffeine and alcohol are both mildly dehydrating, which works against your goal of keeping mucus thin. Menthol cough drops can feel soothing in the moment but have a drying effect on throat tissue that may make things worse over time.
Smoking is the single biggest irritant for mucus-producing airways. Even secondhand smoke exposure can ramp up phlegm production significantly. If you smoke and deal with chronic phlegm, that connection is direct and well-established.