That persistent, thick feeling in the back of your throat is phlegm, and clearing it usually comes down to thinning it out so your body can move it along naturally. Phlegm is mucus produced by your lower airways, and while it plays a protective role (trapping germs, housing antibodies, and shuttling irritants out of your body), excess buildup is uncomfortable and sometimes signals an underlying issue worth addressing.
Why Your Throat Has Extra Phlegm
Before you can effectively clear phlegm, it helps to know what’s driving the overproduction. The most common culprit is post-nasal drip, where mucus from your sinuses drains down the back of your throat. Allergies are the single most frequent cause of post-nasal drip, but colds, sinus infections, cold or dry air, pregnancy, and even certain medications like birth control pills or blood pressure drugs can trigger it.
Chronic acid reflux (GERD) is another major source. Stomach acid irritates the throat lining, and your body responds by producing more mucus as a protective barrier. If your phlegm is worst in the morning or after meals, reflux may be the driver. A deviated septum, weather changes, and spicy foods can also contribute.
Hydration Is the Most Effective First Step
Drinking more fluids thins the mucus your body produces, making it easier to clear from your throat. Water is the simplest option, but warm liquids like tea or broth do double duty: they add hydration while the warmth itself helps loosen thick secretions. Aim to sip consistently throughout the day rather than drinking large amounts at once. If your urine is pale yellow, you’re generally well-hydrated.
Salt Water Gargling
Gargling with warm salt water draws fluid out of swollen throat tissue through osmosis, which helps break up phlegm sitting in the back of your throat. The Mayo Clinic recommends a quarter to half teaspoon of table salt dissolved in eight ounces of warm water. Gargle for 15 to 30 seconds, spit it out, and repeat a few times. You can do this several times a day. The same osmotic effect that reduces swelling also pulls mucus and debris away from the throat lining.
Using an Expectorant
Guaifenesin, the active ingredient in products like Mucinex and Robitussin, works by thinning mucus and phlegm in your airways so you can cough it up more easily. The standard adult dose for regular formulations is 200 to 400 milligrams every four hours, or 600 to 1,200 milligrams every twelve hours for extended-release versions. It won’t stop phlegm production, but it makes what’s there less sticky and easier to move. Drink a full glass of water with each dose, since the medication relies on adequate hydration to work.
Nasal Irrigation for Post-Nasal Drip
If your phlegm is dripping down from your sinuses, rinsing your nasal passages with a saline solution can flush out the mucus before it reaches your throat. Neti pots, squeeze bottles, and saline spray all work. The critical safety rule: never use plain tap water. Tap water can contain organisms like amoebas that are harmless when swallowed but dangerous inside nasal passages. The FDA recommends using only distilled water, sterile water, or tap water that has been boiled for 3 to 5 minutes and cooled. Boiled water should be used within 24 hours.
Adjust Your Indoor Air
Dry air thickens mucus and irritates your airways, which prompts even more phlegm production. The EPA recommends keeping indoor humidity between 30 and 50 percent. A simple hygrometer (available for a few dollars at hardware stores) tells you where you stand. If your home runs dry, especially in winter with forced-air heating, a humidifier in your bedroom can make a noticeable difference overnight. Clean it regularly, though, because standing water in a dirty humidifier breeds mold and bacteria that make things worse.
Reducing exposure to airborne irritants also helps. Cigarette smoke, strong cleaning products, heavy perfumes, and dust are all common triggers for excess mucus production.
Steam Inhalation
Breathing in warm, moist air loosens phlegm in your throat and airways. The simplest method is standing in a hot shower for 10 to 15 minutes with the bathroom door closed. You can also lean over a bowl of hot water with a towel draped over your head. This won’t cure the underlying cause, but it provides immediate, temporary relief when phlegm feels thick and stuck.
The Dairy and Mucus Myth
Many people avoid milk when they’re congested, but clinical evidence doesn’t support this. Drinking milk does not cause the body to produce more phlegm. Research dating back to a 1948 study of roughly 600 people found no connection between dairy intake and mucus production. A more recent study of children with asthma found no difference in symptoms whether they drank dairy milk or soy milk.
What does happen is a sensory trick: when milk mixes with saliva, it creates a slightly thick coating in the mouth and throat that can feel like extra mucus. That sensation fades quickly and doesn’t reflect actual phlegm production. So skipping your morning coffee creamer won’t help clear your throat.
What Phlegm Color Can Tell You
Clear phlegm is normal and usually means your body is doing routine maintenance. Yellow or green phlegm typically signals an infection, though the color alone can’t tell you whether it’s viral or bacterial. Dark brown, sticky phlegm can indicate blood mixing with mucus and is associated with chronic lung conditions. If you cough up phlegm that’s red or streaked with blood, that warrants immediate medical attention.
Color changes that persist beyond two weeks, or phlegm accompanied by fever, shortness of breath, or fatigue, are worth bringing to a healthcare provider. A cough producing non-clear phlegm for more than two weeks is a reasonable threshold for scheduling an appointment.