That stubborn, sticky feeling of phlegm sitting in your throat is usually something you can clear at home with a combination of hydration, simple remedies, and a few habit changes. Phlegm is just mucus that has thickened or accumulated in response to irritation, infection, or inflammation in your airways. Getting rid of it comes down to thinning it out so your body can move it along naturally.
Why Phlegm Builds Up in Your Throat
Your body produces mucus constantly to keep your airways moist and trap dust, allergens, and germs. You only notice it when something causes overproduction or thickening. The most common triggers are respiratory infections like colds and sinus infections, which cause your body to ramp up thick mucus as a defense. Allergies and environmental irritants (smoke, pollution, dry air) also drive excess clear mucus. Acid reflux is another frequent culprit: stomach acid creeping up into your throat irritates the lining, which responds by producing more mucus, often creating that constant throat-clearing sensation even when you’re not sick.
Post-nasal drip, where mucus from your sinuses drains down the back of your throat, is probably the single most common reason people feel phlegm sitting there persistently. It can be triggered by any of the causes above, and it tends to feel worse at night or first thing in the morning.
Drink More Fluids to Thin It Out
The simplest and most effective step is increasing your fluid intake. When you’re well-hydrated, your mucus stays thinner and moves more easily through your airways. When you’re dehydrated, mucus thickens and clings to your throat. Water is the obvious choice, but warm liquids are especially helpful because the heat loosens congestion and soothes irritated tissue. Broth, herbal tea, and warm water with lemon all work well.
Aim to drink consistently throughout the day rather than gulping large amounts at once. If your urine is pale yellow, you’re on track. Dark yellow means you need more fluids.
Salt Water Gargle
Gargling with warm salt water is one of the fastest ways to loosen phlegm clinging to the back of your throat. The salt draws moisture out of swollen tissue, reducing irritation, while the warm water helps break up thick mucus. Mix about 1/4 to 1/2 teaspoon of salt into 8 ounces of warm water, gargle for 15 to 30 seconds, and spit it out. You can repeat this several times a day.
Steam and Humidity
Breathing in warm, moist air loosens mucus in your throat and nasal passages almost immediately. A hot shower works well for this. You can also lean over a bowl of hot water with a towel draped over your head and breathe deeply for five to ten minutes. Adding a few drops of eucalyptus or peppermint oil can make the steam feel more effective at opening your airways, though the moisture itself is doing most of the work.
If your home air is dry, especially during winter months with heating running, a humidifier can prevent mucus from thickening in the first place. The Mayo Clinic recommends keeping indoor humidity between 30% and 50%. Below that range, your mucous membranes dry out and produce thicker, stickier secretions. Above 50%, you risk mold growth, which can make things worse.
Honey and Ginger
Honey coats and soothes an irritated throat, and it can ease the persistent coughing that often accompanies phlegm. A tablespoon of honey stirred into warm water or tea is a simple approach. Ginger contains active compounds called gingerols and shogaols that have anti-inflammatory properties, which can help calm the irritated tissue triggering excess mucus production. Grating fresh ginger into hot water, adding honey, and sipping it slowly combines both benefits. Avoid giving honey to children under one year old.
Over-the-Counter Expectorants
If home remedies aren’t cutting it, an expectorant containing guaifenesin (the active ingredient in products like Mucinex) can help. It works by increasing the volume of fluid in your airways while reducing the thickness of mucus, making it easier for your cough reflex to move phlegm up and out. It doesn’t suppress your cough. It makes your cough more productive so you’re actually clearing something when you cough. Adults typically take one dose every 12 hours, and it’s important to drink plenty of water alongside it since the medication relies on hydration to work properly.
Avoid combining an expectorant with a cough suppressant unless directed to, since suppressing your cough while trying to clear mucus works against the goal.
What Not to Do
Constantly clearing your throat is tempting but counterproductive. The forceful vibration irritates your throat lining, which responds by producing even more mucus, creating a cycle. Try swallowing hard or taking a sip of water instead.
Smoking and secondhand smoke are major mucus triggers. Smoke paralyzes the tiny hair-like structures in your airways that sweep mucus upward, causing it to pool and thicken. If you smoke, this is one of the most impactful changes you can make.
You may have heard that dairy increases phlegm. Research doesn’t support this. A Mayo Clinic review of the evidence found that drinking milk does not cause your body to produce more mucus. What actually happens is that milk and saliva mix to form a slightly thick coating in your mouth and throat that feels like mucus but isn’t. Studies comparing dairy milk and soy milk in children with asthma found no difference in symptoms. So if you enjoy milk, it’s not making your phlegm worse.
What Phlegm Color Tells You
Clear phlegm is normal and usually means allergies, mild irritation, or the early stage of a cold. White or slightly cloudy phlegm often signals congestion as mucus thickens and moves more slowly.
Yellow or green phlegm typically indicates your immune system is actively fighting an infection. The color comes from white blood cells doing their job. This doesn’t automatically mean you need antibiotics, since viral infections produce colored phlegm too, but if it persists beyond 10 to 14 days or comes with fever and worsening symptoms, it’s worth getting checked.
Red, pink, or bloody phlegm is the one that warrants prompt attention. It could stem from something as minor as irritated nasal passages from aggressive blowing, but it can also signal a more serious infection or, in smokers especially, something that needs further evaluation with imaging.
When Phlegm Won’t Go Away
Phlegm from a cold or upper respiratory infection typically resolves within two to three weeks. If yours has lingered longer than that, an underlying cause is likely keeping it going. Chronic post-nasal drip from untreated allergies is one of the most common reasons. Allergy testing and targeted treatment, whether antihistamines, nasal corticosteroid sprays, or allergen avoidance, can make a significant difference.
Acid reflux is another overlooked cause of persistent throat phlegm. Some people experience reflux without classic heartburn, a condition sometimes called silent reflux or LPR. The main symptoms are throat clearing, a lump-in-the-throat sensation, and excess mucus. Elevating the head of your bed, avoiding eating within three hours of lying down, and reducing acidic or spicy foods can help identify whether reflux is contributing.