The fastest way to get phlegm out of your throat is to thin it so it moves more easily, then use controlled breathing techniques to push it up and out. Most people can clear stubborn throat phlegm within minutes using a combination of warm fluids, salt water gargling, and a specific coughing method called the huff cough. Here’s how to do all of it effectively.
The Huff Cough: The Most Effective Clearing Technique
A regular forceful cough actually causes your airways to collapse around trapped mucus, making it harder to bring up. The huff cough, a controlled technique recommended by respiratory therapists, keeps your airways open so phlegm can travel upward.
Think of it as the motion you’d use to fog up a mirror: smaller, more forceful exhales rather than big, explosive coughs. Here’s the process:
- Sit in a chair with both feet on the floor and tilt your chin up slightly with your mouth open.
- Take a slow, moderate breath in through your nose.
- Exhale forcefully in a short burst, as if fogging a mirror, squeezing your abdominal muscles as you do.
- Repeat one or two more times.
- Follow with one strong, deep cough to push the loosened mucus out of the larger airways.
You can repeat this cycle two or three times depending on how congested you feel. One important detail: avoid breathing in quickly or deeply through your mouth between huffs. Rapid inhales can pull the mucus back down and trigger uncontrolled coughing fits.
Salt Water Gargle
Gargling warm salt water draws moisture into the mucus layer through osmosis, loosening thick phlegm so it’s easier to spit out. Mix half a teaspoon of salt into one cup of warm water (not hot), gargle for 15 to 30 seconds, and spit. You can repeat this several times a day as needed. Many people find this gives near-instant relief, especially for phlegm that feels stuck at the back of the throat.
Stay Hydrated and Use Steam
Thick, sticky phlegm is often a hydration problem. Drinking warm fluids throughout the day, such as tea, broth, or plain warm water, helps thin mucus from the inside. Cold water works too, but warm liquids seem to loosen throat phlegm faster.
Steam adds moisture from the outside. A hot shower, a bowl of steaming water with a towel draped over your head, or a humidifier in your room all work. The Mayo Clinic recommends keeping indoor humidity between 30% and 50%. Below that range, dry air thickens mucus and makes it harder to clear. Above it, you risk mold growth, which can worsen congestion.
Honey for Coating and Calming
A spoonful of honey coats the irritated throat lining and can reduce the urge to cough unproductively. In clinical trials with children, buckwheat honey performed as well as standard over-the-counter cough suppressants for relieving nighttime cough and improving sleep. Adults can take one to two teaspoons of honey straight or stirred into warm water or tea. One important note: never give honey to children under one year old due to the risk of botulism.
Over-the-Counter Expectorants
If home remedies aren’t enough, look for an expectorant containing guaifenesin (sold as Mucinex and many store brands). This ingredient works by increasing the volume of mucus in your airways while making it thinner and less sticky, so your cough reflex can actually move it out. Extended-release tablets are typically taken once every 12 hours for adults and children 12 and older. Drink plenty of water alongside it, since the medication needs fluid to do its job.
Avoid cough suppressants if your goal is to get phlegm out. Suppressants reduce the cough reflex, which is the opposite of what you want when you’re trying to clear mucus.
Use Gravity to Your Advantage
Postural drainage uses body positioning so gravity helps pull mucus out of your airways. The simplest version: lie on your side with a pillow supporting your head, or lie on your stomach with a pillow under your hips so your chest angles slightly downward. Stay in position for five to ten minutes, then sit up and use the huff cough technique to clear whatever has drained. Head-up positions carry fewer risks than head-down positions, so if you feel dizzy or uncomfortable tilting downward, stick to lying on your side.
Foods and Drinks That Make Phlegm Worse
Certain foods can increase mucus production or thicken existing phlegm, especially if you have acid reflux. When stomach acid backs up into your throat, your body produces extra mucus to protect the tissue. Foods that weaken the valve between your stomach and esophagus are common culprits: coffee, alcohol, chocolate, carbonated drinks, fried foods, and spicy dishes like chilis.
Dairy gets a lot of blame, but the evidence is mixed. For people with a histamine sensitivity, milk, cheese, and yogurt can genuinely increase mucus. For everyone else, dairy may simply make existing phlegm feel thicker in the mouth without actually producing more of it. If you notice a pattern after eating dairy, it’s worth cutting back temporarily to see if your phlegm improves.
Processed foods with artificial additives and preservatives can also disrupt mucus production for some people. When you’re actively trying to clear your throat, sticking to simple, whole foods and warm liquids gives your body the best conditions to thin things out.
What Phlegm Color Tells You
Clear or white phlegm is normal. It means your mucus membranes are doing their job, and the cause is likely a cold, allergies, or mild irritation. Yellow or green phlegm signals that your immune system is actively fighting something. White blood cells contain enzymes that turn green as they break down, which is why infected mucus changes color. This doesn’t automatically mean you need antibiotics, since viral infections produce green phlegm too, but it’s worth paying attention to how long it lasts.
Brown or rust-colored phlegm can indicate dried blood or, in more serious cases, certain bacterial infections. Red or pink phlegm, meaning fresh blood, needs prompt attention. If you’re coughing up blood without any phlegm mixed in, that warrants an emergency room visit.
When Phlegm Sticks Around Too Long
Most throat phlegm from a cold or respiratory infection clears within one to two weeks. If yours persists beyond that, or if you develop a fever, wheezing, difficulty breathing, or consistently colored (non-clear) phlegm, it’s time to see a healthcare provider. Chronic throat phlegm that lasts months often points to an underlying issue like allergies, acid reflux, or postnasal drip rather than an active infection, and each of those has a different treatment path.