Staying hydrated, sipping warm liquids, and using a specific coughing technique called a “huff” are among the most effective ways to loosen and clear phlegm that feels trapped in your throat. That sticky, bothersome sensation is usually the result of mucus that has become too thick or too abundant for your body’s built-in clearance system to handle efficiently. The good news is that most cases respond well to simple home strategies, but what works best depends partly on why the phlegm is there in the first place.
Why Phlegm Collects in the Throat
Your airways are lined with a thin layer of mucus that functions as a first-line defense, trapping dust, allergens, and microbes so tiny hair-like structures called cilia can sweep them toward the throat to be swallowed or coughed out. In healthy lungs, this system runs smoothly and you barely notice it. Problems start when mucus is either overproduced or becomes dehydrated and concentrated, making it thicker and harder for cilia to move.1PubMed Central. Physiology and pathophysiology of human airway mucus That is essentially what happens during a cold, a bout of allergies, or flare-ups of chronic conditions like asthma and COPD, where the mucus becomes overproduced and its solid content increases, changing its texture and overwhelming the clearance system.2PubMed Central. Mucus Structure, Viscoelastic Properties, and Composition in Chronic Respiratory Diseases
Phlegm pools in the throat for a few common reasons. Postnasal drip, where mucus drains down the back of the nose, is one of the most frequent culprits and is also one of the most common causes of chronic cough.3PubMed Central. Upper Airway Cough Syndrome in Pathogenesis of Chronic Cough Infections, seasonal allergies, cold dry air, and irritants like cigarette smoke can all trigger excess mucus production or thicken what is already there. Sometimes the issue is not the lungs or sinuses at all but the stomach, as we will see below.
Warm Liquids and Hydration
Drinking more fluids is the simplest and most universally recommended step. Water helps thin mucus from the inside out by keeping the airway surface hydrated, which in turn makes it easier for cilia to push mucus along. Warm liquids appear to offer an extra edge. A well-known study found that sipping hot water increased nasal mucus velocity from about 6.2 to 8.4 millimeters per minute, while sipping hot chicken soup pushed it even higher, from roughly 6.9 to 9.2 millimeters per minute. Cold water, by contrast, actually slowed mucus movement.4PubMed. Effects of drinking hot water, cold water, and chicken soup on nasal mucus velocity and nasal airflow resistance The benefit was temporary, fading back to baseline within about 30 minutes, so sipping throughout the day makes more sense than downing one big mug.
Tea, broth, and warm water with honey and lemon all work on the same principle. The warmth helps loosen thick secretions, and the act of swallowing hot liquid may stimulate glandular secretion that further thins the mucus layer. If you find plain water tedious, warm herbal teas serve double duty by keeping you hydrated and providing that heat boost.
Steam and Humidity
Breathing in warm, moist air is another traditional remedy for thick phlegm. The logic is sound: moisture in the airways helps soften and thin sticky mucus so it can be cleared more easily. A hot shower, a bowl of steaming water with a towel draped over your head, or a bedside humidifier are the usual approaches. That said, the clinical evidence for steam inhalation specifically during a cold is less clear-cut than many people assume. A Cochrane review of the available trials found that results were inconsistent, with some studies showing symptom improvement and others showing none, and the overall quality of evidence was rated low.5PubMed Central. Heated, humidified air for the common cold
That does not mean steam is useless. Many people report subjective relief, and no studies showed that it made symptoms worse. The practical takeaway is that a few minutes of steam inhalation is a low-risk option that may help you feel more comfortable, even if it is not a guaranteed mucus dissolver. Just be careful with very hot water near your face, especially around children.
Saline Rinses and Gargling
Rinsing the nasal passages with salt water, using either a neti pot or a squeeze bottle, is one of the more evidence-backed home strategies. In a pilot trial comparing saline nasal irrigation and gargling against standard care during a cold, participants in the saline group had significantly shorter durations of blocked nose (by about 2.7 days), cough (by about 2.4 days), and hoarseness (by about 1.7 days).6Scientific Reports. A pilot, open labelled, randomised controlled trial of hypertonic saline nasal irrigation and gargling for the common cold Participants most commonly reported that the rinse helped clear their nose and made breathing easier.
The salt draws water into the mucus by osmosis, which loosens it, and the physical flushing action washes out trapped debris and allergens. Gargling with warm salt water targets the throat directly and can help dislodge mucus clinging to the back of the pharynx. Use distilled, sterile, or previously boiled water for nasal rinses to avoid introducing new irritants or, in very rare cases, dangerous organisms.
The Huff Cough
Repeated throat clearing is a natural reflex when phlegm feels stuck, but it can irritate the tissue and actually trigger more mucus production, creating a vicious cycle. A more effective alternative is the “huff” cough, a forced exhalation with the mouth open and the glottis (the space between your vocal cords) kept open, rather than slamming it shut as you would in a normal cough. Research in patients with impaired mucus clearance found that huffs produced a clearance rate comparable to voluntary coughing.7PubMed. Effect of enhanced supramaximal flows on cough clearance
To try it, take a medium breath in, then exhale forcefully through an open mouth as if you are fogging a mirror, using your abdominal muscles to push the air out. You can alternate between short huffs (to move mucus from smaller airways) and longer huffs (to push it up and out of the throat). This technique is standard in respiratory physiotherapy and is gentler on the throat than repetitive hard coughing.
Over-the-Counter Medications
When home remedies are not enough, a trip to the pharmacy gives you a couple of options worth knowing about. Guaifenesin, the active ingredient in many expectorant products, is thought to work by increasing hydration and reducing the thickness of mucus, making it easier to cough up.8PubMed Central. The Role of Guaifenesin in the Management of Chronic Mucus Hypersecretion Associated with Stable Chronic Bronchitis: A Comprehensive Review It is widely available and generally well tolerated. The key is to drink plenty of water alongside it, since guaifenesin works partly by pulling fluid into the airways.
Another option, more commonly used in Europe and sometimes available over the counter depending on where you live, is N-acetylcysteine (NAC). NAC acts as a mucolytic by breaking the chemical bonds (disulfide cross-links) that hold thick mucus glycoproteins together, essentially dissolving the gel structure of the mucus.9PubMed. N-Acetylcysteine as an antioxidant and disulphide breaking agent: the reasons why If your phlegm feels particularly thick and rubbery, NAC may be worth discussing with a pharmacist or doctor.
Decongestant sprays and antihistamines can help if the phlegm is driven by allergies or sinus congestion, but these treat the upstream cause rather than the phlegm itself. Antihistamines in particular can dry secretions, which sounds helpful but may occasionally make thick phlegm even stickier. Use them when allergy symptoms like sneezing or a runny nose are clearly present, rather than as a general phlegm remedy.
When the Problem Is Reflux, Not a Cold
If phlegm in the throat keeps coming back without an obvious cold or allergy, one of the most underrecognized culprits is laryngopharyngeal reflux (LPR). Unlike classic heartburn, LPR occurs when stomach contents travel all the way up to the throat and larynx, causing throat clearing, a sensation of a lump in the throat, hoarseness, cough, and excess mucus production.10PubMed Central. An update on current treatment strategies for laryngopharyngeal reflux symptoms Many people with LPR never experience the burning chest pain associated with gastroesophageal reflux, so they do not connect their throat symptoms to their stomach.
LPR is thought to involve both direct chemical irritation from acid and pepsin reaching the throat, and a reflex mechanism that triggers mucus glands to ramp up production.11PubMed Central. Laryngopharyngeal reflux disease: Updated examination of mechanisms, pathophysiology, treatment, and association with gastroesophageal reflux disease If you notice the phlegm is worst in the morning, after meals, or when lying down, reflux is a likely contributor. Lifestyle changes like avoiding late-night eating, elevating the head of the bed, and reducing acidic or fatty foods can make a meaningful difference. When those measures fall short, a doctor may recommend a trial of acid-suppressing medication.
When It Feels Like Phlegm but Is Not
Sometimes the sensation of something stuck in the throat persists even when there is very little mucus present. This is called globus pharyngeus, a persistent feeling of a lump or foreign body in the throat that accounts for up to 4% of referrals to ear, nose, and throat clinics.12PubMed Central. Globus pharyngeus: an update for general practice Patients often assume the sensation is caused by excess mucus or a physical obstruction, but actual structural lesions are rare. The feeling is more commonly linked to abnormal muscle movement in the throat or esophagus, or to LPR.
Recognizing this distinction matters because if the issue is globus rather than true phlegm, all the mucus-thinning strategies above will not fully resolve it. The constant throat clearing that globus sufferers tend to fall into can itself irritate the tissue and perpetuate the cycle. If you have been trying phlegm remedies for weeks without improvement and your throat feels “stuck” rather than “coated,” it is worth mentioning globus to your doctor.
The Milk and Mucus Myth
Few health beliefs are as persistent as the idea that drinking milk makes your body produce more phlegm. The association has been around for centuries, and some researchers have proposed a possible mechanism involving a peptide called beta-casomorphin-7, which is released during the digestion of certain cow’s milk proteins and can stimulate mucus glands in the gut.13PubMed. Does milk increase mucus production? Whether that peptide reaches the respiratory tract in meaningful amounts remains speculative.
The strongest direct test of the idea came from a study in which volunteers were deliberately infected with a common cold virus and their dairy intake tracked alongside objective measurements of nasal secretion weight. Milk and dairy consumption was not associated with any increase in upper or lower respiratory symptoms or secretion volume. People who believed in the milk-mucus link did report feeling more congested, but they did not actually produce more mucus.14American Review of Respiratory Disease. Relationship between Milk Intake and Mucus Production in Adult Volunteers Challenged with Rhinovirus-2 In other words, the effect appears to be perceptual rather than physiological. If dairy gives you a thick, coated feeling in the mouth that is unpleasant when you are already congested, avoiding it during a cold is a personal comfort choice, but it is unlikely to change how much mucus your body is making.
Spicy Foods and Gustatory Rhinitis
While milk gets blamed unfairly, spicy food actually does trigger a sudden burst of watery mucus, though the mechanism is different from what most people expect. Eating hot peppers, horseradish, or wasabi can provoke gustatory rhinitis, a reflex in which spicy compounds stimulate nerve receptors in the mouth and nose that activate mucus-producing glands. In a study of people with this condition, spicy food challenges reliably induced rhinorrhea (a fancy term for a runny nose), with significant increases in the protein content of nasal secretions. The response was blocked by pretreating the nose with atropine, confirming it is a nerve-driven glandular reflex rather than an allergic reaction.15Journal of Allergy and Clinical Immunology. Gustatory rhinitis: A syndrome of food-induced rhinorrhea
This is actually useful knowledge if you are trying to clear phlegm. A small dose of spicy food or a bit of horseradish can temporarily thin and flush mucus, making it easier to expel. The effect is short-lived and the mucus produced is thin and watery rather than the thick sticky kind, so it can provide a brief window of relief. Just do not overdo it if you have reflux, since spicy foods can aggravate LPR.
Chronic Mucus and Ongoing Conditions
For some people, phlegm in the throat is not an occasional nuisance but a daily reality. Chronic mucus hypersecretion is a hallmark feature of COPD, where ongoing inflammation causes the mucus-producing glands to enlarge and overproduce. This chronic overproduction contributes to increased risk of infections and disease progression in people with COPD.16PubMed Central. Mucus Hypersecretion in Chronic Obstructive Pulmonary Disease and Its Treatment Asthma, cystic fibrosis, and bronchiectasis can produce similar patterns of persistent thick mucus. If you are dealing with daily phlegm that does not respond to the strategies described above, it is a signal that something beyond a garden-variety cold is going on and warrants medical evaluation.
Certain medications can also contribute. ACE inhibitors, a common class of blood pressure drugs, are well known for causing a persistent dry cough and throat irritation in a subset of users. If phlegm or cough appeared shortly after starting a new medication, bring it up with the prescribing doctor before assuming the problem is allergies or a lingering infection.
When to See a Doctor
Most phlegm clears up on its own within a couple of weeks, especially when related to a cold or temporary irritant. Persistent symptoms deserve medical attention. Clinicians recommend endoscopic examination if throat symptoms last beyond a few weeks or if red-flag symptoms develop.17BMJ. Laryngitis Those red flags include blood in the phlegm, unexplained weight loss, difficulty swallowing that is getting worse, a lump you can feel in the neck, or hoarseness lasting more than three weeks. Any of these warrant a prompt visit rather than continued home treatment.
Even without red flags, phlegm that lingers for more than a month, recurs frequently, or is thick and discolored (green or brown) beyond the first few days of a cold is worth discussing with your doctor. The underlying cause could range from chronic sinusitis to reflux to an environmental irritant you have not identified yet, and the right treatment depends entirely on which one it is.