The fastest way to get phlegm out of your throat is to thin it so it moves more easily, then use the right coughing technique to bring it up. Most people reach for a glass of water or try to hack it out, but a combination of hydration, steam, specific breathing methods, and a few household remedies works far better than any single approach.
Why Phlegm Gets Stuck
Phlegm is thicker than the thin layer of mucus that normally lines your airways. When you’re fighting a cold, dealing with allergies, or breathing dry indoor air, your body ramps up mucus production and the mucus itself becomes stickier. It pools in your throat, often dripping down from your sinuses (post-nasal drip) or climbing up from your lungs. The key to clearing it is reducing its thickness so the tiny hair-like structures lining your airways can sweep it upward, where a cough can finish the job.
The Huff Cough Technique
Regular coughing often isn’t effective because a hard, forceful cough can actually collapse your smaller airways and trap mucus deeper. A technique called the huff cough solves this. It generates enough force to move phlegm upward without slamming your airways shut.
Here’s how to do it: sit on a chair or the edge of your bed with both feet flat on the floor. Tilt your chin up slightly and open your mouth. Take a slow, deep breath until your lungs feel about three-quarters full. Then exhale in a steady, forceful “huff,” like you’re fogging up a mirror. Repeat this one or two more times, then follow with one strong, deliberate cough. That final cough should bring the loosened mucus up and out. You can repeat the full cycle two or three times depending on how congested you feel.
One important detail: don’t gasp in quickly through your mouth right after coughing. That rapid inhale can pull mucus back down and trigger an uncontrolled coughing fit.
Hydration and Humidity
Drinking warm fluids is the simplest thing you can do. Water, broth, and herbal tea all help thin mucus from the inside. Warm liquids have a slight edge over cold ones because the heat adds a mild steam effect as you drink, loosening phlegm in your throat on contact.
The air around you matters just as much. When indoor humidity drops below 50%, mucus particles change in size and your airways’ natural clearing system becomes less effective. A humidifier in your bedroom can make a noticeable difference overnight, which is when phlegm tends to feel worst. If you don’t have a humidifier, sitting in a steamy bathroom for 10 to 15 minutes works as a short-term substitute. Breathing in the warm, moist air softens thick mucus and makes it easier to cough up.
Salt Water Gargle
Gargling with salt water draws moisture out of swollen throat tissues and helps break up the phlegm sitting on the surface. Mix roughly a quarter to a half teaspoon of salt into 8 ounces of warm water. Gargle for 15 to 30 seconds, spit it out, and repeat a few times. The salt creates an osmotic pull that reduces swelling and loosens mucus, while also creating a less hospitable environment for bacteria. You can do this several times a day without any downside.
Honey as a Natural Remedy
Honey coats the throat, reduces irritation, and has measurable effects on cough frequency. A study published in JAMA Pediatrics compared honey to a common over-the-counter cough suppressant and found honey performed as well or better across every measure. Children who received honey before bed saw a 1.89-point improvement in cough frequency compared to 1.39 points for the cough suppressant and 0.92 points for no treatment. Sleep quality improved more with honey too: a 2.49-point gain versus 1.79 for the medication. The cough suppressant, notably, wasn’t significantly better than doing nothing at all.
A spoonful of honey on its own or stirred into warm tea can soothe an irritated throat and reduce the coughing cycle that keeps phlegm churning. Just don’t give honey to children under one year old due to the risk of botulism.
Clearing Post-Nasal Drip
A large share of throat phlegm doesn’t originate in the throat at all. It drips down from your sinuses, especially during allergy season or a sinus infection. If your phlegm problem gets worse when you lie down or first thing in the morning, post-nasal drip is the likely cause.
Nasal irrigation, using a neti pot or squeeze bottle with a sterile saline solution, thins the mucus clogging your sinuses and flushes out allergens, pathogens, and debris before they can drip into your throat. It’s effective for allergies, sinus infections, colds, and flu. Always use distilled, sterile, or previously boiled water for nasal irrigation, never tap water straight from the faucet.
Over-the-Counter Options
The most widely available pharmacy option is guaifenesin, sold under brand names like Mucinex and Robitussin. It’s an expectorant, meaning it thins mucus so you can cough it out more easily. It won’t stop you from coughing, and that’s actually the point: you want to get the phlegm moving, not suppress the reflex that clears it. Prescription mucolytics work differently and are typically reserved for chronic lung conditions, not a regular cold or bout of congestion.
Avoid combining an expectorant with a cough suppressant unless you have specific reasons to do so. Suppressing your cough while trying to clear phlegm works against itself.
The Dairy Myth
You’ve probably heard that milk makes phlegm worse. It doesn’t. Drinking milk does not cause your body to produce more mucus. What actually happens is that milk mixes with saliva to form a slightly thick coating in your mouth and throat. That lingering sensation feels like extra phlegm, but it’s not. If you find dairy uncomfortable when you’re already congested, it’s fine to skip it temporarily for comfort, but it’s not making your mucus problem worse.
What Phlegm Color Tells You
Clear or white phlegm is typical during a cold or mild irritation. Yellow or green phlegm means your immune system is actively fighting, usually an infection. The greener the color, the harder your body is working. That green tint comes from white blood cells that have done their job and died off. Yellow or green phlegm during a cold doesn’t automatically mean you need antibiotics, but if you still have a fever and feel achy after 10 to 12 days, it’s worth seeing a doctor to rule out a bacterial infection.
Brown or rust-colored phlegm blown into a tissue usually points to dried blood from irritated nasal passages or exposure to dirt and dust. But brown phlegm that you cough up from your chest is different. That can signal bronchitis, where the airways leading to your lungs are inflamed from persistent coughing and mucus buildup. Coughing up brown phlegm warrants medical attention. The same goes for any phlegm accompanied by prolonged fever, difficulty breathing, or symptoms that keep getting worse instead of better.
Putting It All Together
The most effective approach layers several of these strategies. Stay well hydrated throughout the day. Keep your indoor air humid, especially at night. Use a salt water gargle when your throat feels coated. Try honey in warm tea before bed. If your phlegm is draining from your sinuses, add nasal irrigation to your routine. And when it’s time to cough, use the huff technique instead of straining with a forceful hack. An over-the-counter expectorant can help on the worst days, but it works best alongside everything else rather than on its own.