What Helps Get Rid of Phlegm in Your Throat?

Staying well hydrated, drinking warm fluids, gargling with salt water, and using over-the-counter expectorants are among the most reliably effective ways to thin and clear phlegm from your throat. But the best approach depends on why the phlegm is there in the first place, because a cold, acid reflux, and allergies each call for somewhat different strategies. What follows covers the full range of remedies worth trying and the evidence behind each.

Why Your Throat Produces Extra Mucus

Your airways are lined with a mucus layer that traps dust, bacteria, and other particles so tiny hair-like structures called cilia can sweep them upward and out. This mucus clearance system is your lungs’ primary mechanical defense, and it works best when mucus stays at the right consistency, neither too thick nor too thin. The speed at which cilia can move mucus depends heavily on how hydrated (or concentrated) that mucus is.

1PubMed Central. Physiology and pathophysiology of human airway mucus

When you get a cold, your immune system ramps up mucus production to flush the virus out. Allergies trigger a similar response. Acid reflux can splash stomach contents up past the esophagus and irritate the throat, prompting it to produce a protective mucus coating. Chronic conditions like COPD and bronchiectasis cause mucus to become dehydrated and abnormally thick, making it much harder to clear. Whatever the trigger, the sensation of phlegm stuck in your throat comes down to too much mucus, too-thick mucus, or both.

Warm Fluids and Hydration

The simplest and most accessible remedy is also one of the best-supported: drink more fluids, especially warm ones. Hydration works from the inside out. Your airway lining generates the fluid that keeps mucus at the right consistency through a process of water and ion transport across the tissue surface. When you’re dehydrated, that supply shrinks and mucus gets stickier.

Hot liquids offer an extra benefit beyond hydration. A study measuring nasal mucus velocity found that sipping hot water increased the speed at which mucus moved through the nasal passages from about 6 mm per minute to roughly 8.4 mm per minute. Hot chicken soup did even better, pushing velocity up to about 9.2 mm per minute. Cold water, by contrast, slowed mucus movement significantly. The researchers attributed the effect partly to inhaling water vapor while sipping.

2PubMed. Effects of drinking hot water, cold water, and chicken soup on nasal mucus velocity and nasal airflow resistance

The boost was temporary, returning to baseline within about 30 minutes. But for someone dealing with persistent throat phlegm, sipping warm water, tea, or broth throughout the day can provide repeated relief. The warmth loosens secretions momentarily and the fluid itself helps keep your body’s mucus-thinning machinery working.

Steam Inhalation

Breathing in warm, moist air is a time-honored remedy, and research supports it as more than folklore. Steam inhalation using a facial steamer has been shown to produce positive effects on vocal quality, which is relevant because a throat loaded with thick mucus directly affects how your voice sounds and feels.

3PubMed. Effects of steam inhalation on voice quality-related acoustic measures

The mechanism is straightforward: warm steam adds moisture directly to the airway surface, helping to rehydrate thickened mucus so cilia can move it more easily. You can use a commercial facial steamer, lean over a bowl of hot water with a towel draped over your head, or simply spend a few extra minutes in a hot shower. The effect is modest and temporary, similar to warm fluids, but combining the two gives you both internal and external hydration at once. Just be careful with the water temperature to avoid burns, and keep young children away from open bowls of hot water.

Gargling and Nasal Irrigation With Salt Water

Salt water gargling is inexpensive, widely available, and increasingly well-supported by clinical evidence. A study of patients with postnasal drip syndrome found that gargling with normal saline for 12 weeks led to significant improvements in symptom scores, including the constant mucus-in-throat sensation that characterizes the condition.

4PubMed. Postnasal drip syndrome: A new definition and successful oral gargling treatment

For phlegm caused by a common cold, there is also evidence that hypertonic saline nasal irrigation and gargling can shorten the duration of several symptoms, including congestion, cough, and hoarseness, by one to nearly three days compared to standard care. Participants in that research reported that the practice helped clear the nose, made breathing easier, and sped up recovery.

A basic recipe is a half teaspoon of table salt dissolved in a cup of warm water. You can gargle with it, or use a neti pot or squeeze bottle to rinse your nasal passages, which addresses the common situation where phlegm in the throat is actually mucus dripping down from the sinuses. Rinsing regularly, two or three times a day during a cold, seems to be where the benefit comes from rather than a single session.

Over-the-Counter Expectorants

If you’ve browsed the cold-and-flu aisle, you’ve probably seen guaifenesin, the active ingredient in products like Mucinex and Robitussin Chest Congestion. It remains the only legally marketed over-the-counter expectorant in the United States and is considered safe and effective for mucus-related symptoms from acute upper respiratory infections and stable chronic bronchitis.

5PubMed Central. Role of guaifenesin in the management of chronic bronchitis and upper respiratory tract infections

Guaifenesin works by loosening mucus in the airways and making coughs more productive, meaning you’re coughing up the phlegm rather than just hacking unproductively. There’s also evidence it may reduce the sensitivity of cough receptors, possibly because the extra fluid it draws into the airways physically shields the receptors from irritants.

6PubMed. Effect of guaifenesin on cough reflex sensitivity

One important practical note: guaifenesin works best when you drink plenty of water alongside it, since it relies on fluid to do its job. Taking it while dehydrated defeats the purpose. Also, make sure you’re reaching for a product labeled “expectorant” rather than a “cough suppressant” (typically dextromethorphan). Suppressants quiet the cough reflex, which can be useful at bedtime but counterproductive when you need to actually clear phlegm. Many combination products contain both, so read the label carefully.

Prescription and Specialized Mucolytics

For people with chronic conditions that produce thick, stubborn mucus, doctors sometimes prescribe N-acetylcysteine (NAC). Unlike guaifenesin, which adds fluid to thin mucus, NAC works by breaking the chemical bonds that give mucus its thick, gel-like structure. Mucus glycoproteins are held together by disulfide bonds, and NAC snaps those bonds apart, physically reducing the mucus from a thick gel to a thinner, easier-to-clear liquid.

7PubMed. N-Acetylcysteine as an antioxidant and disulphide breaking agent: the reasons why

NAC is widely used in conditions like cystic fibrosis and COPD, where mucus becomes extremely concentrated and difficult to move. It’s available as an oral supplement in many countries and as an inhaled nebulizer solution by prescription. If your phlegm problem is chronic and hasn’t responded to the simpler remedies, it’s worth asking a doctor about. For occasional throat phlegm from a cold, though, guaifenesin and hydration are usually sufficient.

Breathing Techniques That Clear Mucus

You don’t always need a product to shift phlegm. Several airway clearance techniques developed for people with chronic lung disease work just as well for anyone dealing with a stubborn mucus buildup. Directed coughing, the forced expiratory technique (a controlled “huff” rather than a full cough), and a method called autogenic drainage are all more effective at clearing mucus than doing nothing, and roughly comparable to postural drainage, which involves positioning your body so gravity helps mucus flow out of the lungs.

8PubMed. Forced expiratory technique, directed cough, and autogenic drainage

The huffing technique is particularly useful for everyday phlegm. Instead of a deep, forceful cough, you take a medium breath, hold it for a beat, and then exhale forcefully through an open mouth as though you’re fogging a mirror. This moves air behind the mucus and pushes it upward without the violent closure of the vocal cords that a regular cough involves, which can sometimes trap mucus rather than clear it. Repeating a few cycles of huffing can shift phlegm that a normal cough won’t budge. These techniques require no equipment and no help from anyone else.

Honey for Cough and Throat Mucus

Honey has a surprisingly strong evidence base for upper respiratory symptoms. A systematic review and meta-analysis pooling data from multiple trials found that honey reduced both cough frequency and cough severity compared to usual care, and it also improved overall symptom scores.

9PubMed. Effectiveness of honey for symptomatic relief in upper respiratory tract infections: a systematic review and meta-analysis

A separate double-blind trial in children found that parents consistently rated honey products higher than a placebo for relieving nighttime cough and improving sleep during a cold.

10Pediatrics. Effect of Honey on Nocturnal Cough and Sleep Quality: A Double-blind, Randomized, Placebo-Controlled Study

Honey likely works through a combination of its thick, soothing coating on the irritated throat and possible mild anti-inflammatory and antimicrobial properties. A spoonful straight, or stirred into warm water or tea, is a practical remedy. The one major caveat: honey should never be given to children under one year old because of the risk of infant botulism. For everyone else, it’s a low-risk option that genuinely helps.

When Acid Reflux Is the Culprit

If your phlegm problem isn’t tied to a cold or allergies and just never seems to go away, acid reflux may be the cause. Laryngopharyngeal reflux, sometimes called “silent reflux” because it often occurs without classic heartburn, happens when stomach contents travel past the upper esophageal sphincter and reach the throat. This causes excess throat mucus, a sensation of something stuck in the throat (globus), hoarseness, and chronic cough.

11PubMed Central. Laryngopharyngeal reflux and Helicobacter pylori

A study investigating consecutive patients whose main complaint was chronic excessive throat phlegm found that roughly three out of four had pathological gastroesophageal reflux when formally tested. Yellow-tinged throat phlegm was particularly suggestive of reflux involving bile from the duodenum.

12PubMed. The role of (duodeno)gastroesophagopharyngeal reflux in unexplained excessive throat phlegm

This means that for a sizable number of people dealing with persistent throat phlegm, the real fix isn’t an expectorant or steam inhalation but rather treating the reflux itself. Elevating the head of the bed, avoiding eating close to bedtime, cutting back on acidic and fatty foods, and using acid-reducing medications can make the phlegm disappear once the underlying irritation is addressed. If you’ve been clearing your throat constantly for weeks or months with no obvious cold or allergy trigger, reflux is worth investigating with a doctor.

Allergies and Postnasal Drip

Allergic rhinitis, whether seasonal or year-round, is another major driver of chronic throat phlegm. The mechanism is postnasal drip: inflamed nasal and sinus tissues produce excess mucus that flows down the back of the throat. You might not have a stuffy or runny nose in the classic sense, yet still feel a constant trickle of mucus collecting in your throat.

When allergies are the cause, treatments directed at the allergic inflammation work better than mucus-thinning strategies alone. Intranasal corticosteroid sprays are first-line for this. A trial of mometasone furoate nasal spray in patients with allergic rhinitis showed significant improvement in both daytime cough severity and overall nasal symptoms compared to placebo.

13Annals of Allergy, Asthma & Immunology. Relief of cough and nasal symptoms associated with allergic rhinitis by mometasone furoate nasal spray

Antihistamines can help too, particularly the older sedating types like diphenhydramine, which have a drying effect on secretions. The newer non-sedating antihistamines are better for daytime use but may be less effective at drying up postnasal drip specifically. If you suspect allergies are behind your phlegm, a daily nasal steroid spray used consistently for at least a couple of weeks is worth trying before reaching for expectorants.

The Milk and Mucus Question

Few health beliefs are as persistent as the idea that drinking milk increases mucus production. The reality is more complicated than either side of the debate usually admits. A controlled study that deliberately infected volunteers with a rhinovirus (a common cold virus) found no statistically significant association between dairy intake and the amount of nasal secretions produced. People who already believed milk makes mucus did report feeling more congested, but their actual secretion measurements were no different from the non-believers.

14American Review of Respiratory Disease. Relationship between Milk Intake and Mucus Production in Adult Volunteers Challenged with Rhinovirus-2

That would seem to close the case, but it hasn’t. A hypothesis based on more recent research suggests a potential mechanism: a protein fragment called beta-casomorphin-7, produced during digestion of a type of cow’s milk protein (A1 beta-casein), can stimulate mucus-producing glands in the gut, and could theoretically do the same in the respiratory tract in people with existing inflammation.

15PubMed. Does milk increase mucus production?

Adding another layer, a blinded trial found that adults who complained of persistent excess nasopharyngeal mucus did report significantly less mucus after following a dairy-free diet.

16PubMed. Effect of a dairy diet on nasopharyngeal mucus secretion

So where does this leave you? If you don’t normally have throat mucus issues, dairy is unlikely to cause them. But if you already deal with chronic throat phlegm and suspect dairy makes it worse, a two-week trial of cutting dairy is harmless and could be informative. The evidence is mixed enough that neither “milk definitely causes mucus” nor “the milk-mucus link is a complete myth” is a fair summary.

Smoking, Vaping, and Indoor Air Quality

If you smoke and have persistent phlegm, the cigarettes are almost certainly a major factor. Tobacco smoke paralyzes and eventually destroys the cilia that sweep mucus out of your airways, leaving mucus sitting in place and accumulating. Quitting smoking is the single most impactful thing a smoker can do for chronic phlegm.

Switching to e-cigarettes doesn’t entirely solve the problem. Research has shown that e-cigarette vapor, particularly with nicotine, reduces the hydration of the airway surface and increases mucus viscosity. It also slows mucociliary clearance, the speed at which cilia transport mucus, in a dose-dependent manner.

17PubMed Central. Electronic Cigarette Vapor with Nicotine Causes Airway Mucociliary Dysfunction Preferentially via TRPA1 Receptors

That said, the damage from vaping appears less severe than from combustible cigarettes. A study measuring mucociliary clearance times found that exclusive e-cigarette users had clearance times similar to those of former smokers and never-smokers, around 7 to 8 minutes, while current cigarette smokers had much slower clearance at about 13 minutes.

18PubMed Central. Impact of exclusive e-cigarettes and heated tobacco products use on muco-ciliary clearance

Indoor air quality matters too, especially during winter when homes are sealed up and heating systems dry out the air. Running a humidifier keeps airway moisture levels up, which helps mucus stay thin enough to clear easily. HEPA air filters can reduce airborne particles and volatile organic compounds substantially. A study in homes of asthmatic children found that a HEPA filtration system reduced particulate matter by an average of 72% and volatile organic compounds by 59%, with measurable improvements in airway inflammation markers.

19Building and Environment. Effectiveness of heating, ventilation and air conditioning system with HEPA filter unit on indoor air quality and asthmatic children’s health

Herbal Remedies and What They Can Realistically Do

Among herbal options, ivy leaf extract is one of the few that has been studied systematically. It contains compounds called saponins that are believed to have expectorant properties, and laboratory studies have found evidence of potential bronchodilating, anti-inflammatory, and cough-suppressing activity.

20PubMed Central. Ivy leaf (Hedera helix) for acute upper respiratory tract infections: an updated systematic review

Ivy leaf syrups and drops are widely available in Europe and increasingly in the US. They’re generally well tolerated, and many people find them helpful for productive coughs, though the clinical evidence is less robust than for guaifenesin or honey. Other commonly mentioned herbs, like eucalyptus, thyme, and peppermint, have a long tradition of use for respiratory complaints. Eucalyptus oil in a steam bowl can feel dramatically clearing, likely through its effect on nasal cold receptors rather than any direct mucus-thinning action. These remedies fall into the “probably won’t hurt, might help, not strongly proven” category, which is fine as long as you’re not relying on them for a serious underlying condition.

Putting a Practical Plan Together

For short-term phlegm from a cold or mild irritation, the combination of frequent warm fluids, steam inhalation, salt water gargling, and honey covers most of what the evidence supports. Adding guaifenesin with plenty of water can help if the phlegm is particularly thick. For nighttime coughing with phlegm, a spoonful of honey before bed has genuine support behind it.

For persistent throat phlegm lasting more than a few weeks, the approach shifts. You need to identify the underlying cause. Chronic phlegm with no obvious cold or infection points toward reflux, allergies, or environmental irritants. An intranasal steroid spray trial can reveal whether allergic postnasal drip is the issue. Dietary and lifestyle adjustments for reflux, such as elevating your bed and avoiding late meals, can clarify whether acid is the driver. If you smoke or vape, quitting or at least reducing exposure will let your airways’ natural clearance system recover. And if mucus remains stubbornly thick despite all of this, a conversation with a doctor about mucolytics or a referral to an ENT specialist is the reasonable next step.