Your body already has a built-in mucus-clearing system, and most of what you can do at home involves helping that system work better rather than replacing it. Tiny hair-like structures called cilia line your airways and beat in coordinated waves to push mucus, trapped particles, and pathogens upward toward the throat, where you swallow or cough them out. When illness, chronic lung disease, or a physical obstruction overwhelms that system, a range of breathing techniques, devices, medications, and emergency maneuvers can step in. The right approach depends on whether you’re dealing with a stubborn chest cold, a chronic condition like COPD or cystic fibrosis, weakened muscles that make coughing difficult, or a sudden choking episode.
How Your Body Clears Mucus on Its Own
The lungs rely on two main defenses to keep airways open. The first is mucociliary clearance: a thin layer of mucus sits on top of a watery layer that bathes the cilia, and those cilia beat in coordinated waves to move the mucus and whatever is trapped in it up and out of the lungs. This system works continuously, even while you sleep.
The second defense is coughing. A cough generates a burst of high-speed airflow that shears mucus off the airway walls and propels it toward the mouth. Coughing is a reflex arc involving sensors in the airway lining, nerve pathways to the brain, and the coordinated contraction of chest, abdominal, and throat muscles. How effective a cough is depends heavily on how much air you can draw in beforehand and how forcefully the muscles can compress it.
In a healthy person, these two systems handle normal mucus production without any conscious effort. Problems arise when mucus becomes too thick, when the cilia are damaged or paralyzed, when the muscles that power a cough are weakened, or when something physically blocks the airway. Each of those scenarios calls for a different strategy.
Breathing Techniques You Can Do Yourself
Respiratory physiotherapists have developed several structured breathing methods that help move mucus without needing equipment. The most widely taught is the Active Cycle of Breathing Technique, or ACBT. It alternates between relaxed breathing, deep breathing to get air behind mucus plugs, and “huffing,” which is a sharp, open-throated exhale (like fogging a mirror) that moves mucus from smaller airways into the larger ones where a cough can clear it.
ACBT has been studied most in cystic fibrosis, where thick mucus is a daily problem. Research in children with cystic fibrosis found that ACBT contributed effectively to clearing sputum from deeper parts of the lungs and improved overall mucociliary clearance. A Cochrane systematic review comparing ACBT with other clearance strategies, including autogenic drainage and oscillating devices, found no significant differences in sputum weight, lung function, or oxygen levels between them. That sounds like a draw, but the practical takeaway is encouraging: ACBT works about as well as more complex alternatives, and you can do it anywhere without equipment.
Huffing deserves its own mention because it’s the technique many people find easiest to learn. A huff uses the same airflow physics as a cough but with the throat kept open, which is gentler on the airways and less likely to cause them to collapse in people with conditions like COPD. Studies comparing huffing with directed coughing found that both required similar energy expenditure, and a pilot study in cystic fibrosis patients found that a specific cough technique was comparable to the forced expiration technique (a close relative of huffing) for moving mucus. In other words, if coughing feels more natural to you than huffing, both get the job done, but huffing may feel less exhausting for people who cough frequently throughout the day.
Postural Drainage and Gravity
Positioning your body so that gravity helps drain specific lung segments is one of the oldest airway clearance methods. Postural drainage typically involves lying in particular positions, sometimes with the head lower than the chest, so mucus flows from smaller airways into larger central ones where it can be coughed out. A physiotherapist might combine this with percussion (rhythmic clapping on the chest wall) or vibration to loosen sticky secretions.
A study of cystic fibrosis patients using radioactive tracer particles found that 20 minutes of postural drainage combined with forced expiration cleared mucus significantly faster than no treatment. About 30 minutes after the session, roughly four to five times more of the tagged material had cleared from the lungs compared with untreated control periods. Positive expiratory pressure therapy (breathing out against a mild resistance) combined with the same forced expiration technique produced similar results.
The practical point is that if you’re dealing with a productive chest infection or a chronic mucus problem, spending 15 to 20 minutes in a gravity-assisted position before doing your huffing or coughing routine may help you clear more mucus per session. The specific positions depend on which part of the lung is most affected; a respiratory therapist can map those out for you. One useful mental model from the physiotherapy literature compares the process to getting ketchup out of a glass bottle: you tip it, you tap it, and then you use a burst of airflow to move the loosened material out.
Devices That Help Move Mucus
For people who need airway clearance regularly, several categories of devices can assist.
Oscillating Positive Expiratory Pressure Devices
Handheld gadgets like the Flutter valve, Aerobika, or Acapella create vibrations and back-pressure as you exhale through them. The oscillations are thought to loosen mucus from airway walls while the positive pressure helps keep airways open. A systematic review and meta-analysis in COPD patients found that these devices were associated with fewer symptoms and exacerbations, and users walked an average of about 50 meters farther in a six-minute walk test compared with controls. The review noted, however, that most studies were short-term and had a high risk of bias, so the true long-term benefit remains uncertain.
These devices are inexpensive, portable, and require no electricity, which makes them popular for daily home use. They work best when combined with the breathing techniques described above rather than used in isolation.
High-Frequency Chest Wall Oscillation Vests
An inflatable vest connected to an air-pulse generator rapidly compresses and releases the chest wall, shaking mucus loose. A study comparing a mobile vest with a standard vest found comparable sputum production between the two, along with imaging evidence that mucus shifted from deeper lung tissue toward larger airways during treatment. These vests are primarily prescribed for cystic fibrosis and other conditions where daily clearance is essential, and they tend to be expensive without insurance coverage.
Mechanical Insufflation-Exsufflation
For people whose cough muscles are too weak to generate adequate airflow, particularly those with neuromuscular diseases like muscular dystrophy, spinal muscular atrophy, or ALS, a device called a mechanical insufflator-exsufflator (commonly known by the brand name CoughAssist) can simulate a cough. It delivers a deep breath of positive pressure followed by an abrupt switch to negative pressure, pulling air and mucus out of the lungs. A pediatric study found that chronic collapsed lung segments resolved in several patients after starting this therapy, and the frequency of pneumonia dropped. The device was safe and well tolerated in the vast majority of children studied.
The evidence picture is a bit complicated here. A later review concluded that the scientific evidence doesn’t firmly support mechanical insufflation-exsufflation for cough augmentation in neuromuscular disease, but acknowledged that clinicians face a practical reality: for patients who simply cannot cough effectively, there are few alternatives. Combining the device with manual chest or abdominal compression during the exsufflation phase can boost peak cough flow further, particularly in patients who can still stack air into their lungs before the assisted cough.
Medications and Nebulized Treatments
Several drugs can make mucus easier to clear, either by thinning it, increasing the watery layer beneath it, or speeding up ciliary beating.
- Hypertonic saline: Nebulized salt water (usually 3% to 7% concentration) draws water into the airways by osmosis, hydrating the mucus layer and making it easier for cilia to move. It has been shown to increase mucociliary clearance and is commonly used in cystic fibrosis care.
- Dornase alfa (rhDNase): In cystic fibrosis, mucus is thick partly because dying white blood cells release DNA into it. This enzyme breaks down that DNA, reducing mucus viscosity. It has been shown to improve the effectiveness of cough for clearing secretions.
- N-acetylcysteine and carbocisteine: These mucolytics break the chemical bonds within mucus proteins. Clinical improvement in terms of easier expectoration and fewer infectious flare-ups has been reported with their use, though the evidence for direct improvement in mucociliary clearance rates is mixed.
- Bronchodilators: Beta-agonists (like albuterol) open narrowed airways, giving mucus a wider channel to travel through. They may also speed ciliary beat frequency. Methylxanthines (like theophylline) have similarly been shown to increase mucociliary clearance.
The choice of medication depends on the underlying condition. Someone with a one-off chest infection probably doesn’t need nebulized hypertonic saline, while someone with cystic fibrosis or severe bronchiectasis may use it daily. A doctor or respiratory therapist can sequence these treatments so that a bronchodilator opens the airways first, a mucolytic thins the mucus next, and then breathing techniques or a device session clears the loosened secretions.
Staying Hydrated and Drinking Hot Fluids
The conventional wisdom that you should “drink plenty of fluids” when congested has a kernel of truth, though it works differently than most people assume. Dehydration thickens mucus, so staying well-hydrated prevents it from becoming stickier than it needs to be. There isn’t strong evidence, however, that drinking extra water beyond normal hydration makes mucus thinner or clears it faster.
Hot fluids, on the other hand, do have a measurable short-term effect on nasal mucus flow. A classic study found that sipping hot water increased nasal mucus velocity from a baseline of about 6 mm per minute to roughly 8.4 mm per minute, and hot chicken soup increased it to about 9.2 mm per minute. Cold water, by contrast, actually slowed mucus movement. The effect faded within 30 minutes, and the researchers attributed it largely to inhaling warm water vapor rather than to any special properties of the liquid itself.
So hot tea, broth, or yes, chicken soup can temporarily speed up the clearing of nasal mucus. The benefit is real but brief, which is why people with colds instinctively reach for warm drinks throughout the day rather than having one cup and calling it done.
What Smoking Does to Airway Clearance
Smoking attacks the clearance system from multiple directions. Research examining the cellular makeup of the airway lining found that active smokers had a shift toward more mucus-producing goblet cells and fewer ciliated cells, the very cells responsible for sweeping mucus out. The expression of genes controlling mucin production and sodium channels (which regulate the fluid layer beneath mucus) was also altered in smokers and COPD patients compared to never-smokers. The encouraging finding was that these changes appeared to reverse within about a year of quitting, with ex-smokers showing cell compositions similar to people who had never smoked.
This means that if you smoke and struggle with persistent mucus, all the techniques and devices described above are fighting against a self-inflicted handicap. Quitting doesn’t just slow the damage; it actively allows the clearance machinery to rebuild.
Emergency Airway Obstruction From Choking
Everything discussed so far addresses mucus. A completely different scenario is a sudden physical obstruction, like choking on food. Here the concern isn’t mucus viscosity or ciliary function but rather a foreign body blocking the airway, and the response needs to be immediate.
For a conscious adult who is choking and unable to speak or breathe, the two most commonly recommended maneuvers are back blows (firm strikes between the shoulder blades with the heel of the hand) and abdominal thrusts (the Heimlich maneuver). Studies have found that back blows tend to generate higher peak airway pressures, while abdominal and chest thrusts produce their effect over a longer time. Guidelines from major resuscitation councils now recommend alternating between the two: five back blows followed by five abdominal thrusts, repeating until the object is expelled or the person becomes unconscious.
For an unconscious choking victim, the approach shifts to CPR, which generates chest compressions that can dislodge an object while also maintaining circulation. A case series described a “table maneuver” used successfully in elderly patients who lost consciousness while choking: back blows were applied while the patient was positioned over the edge of a table, and in several cases the foreign body was forcefully expelled after just a few blows.
Infant choking requires a modified technique. The baby is held face-down along the rescuer’s forearm (head lower than the body), and back blows are delivered between the shoulder blades, alternating with chest thrusts using two fingers on the breastbone. A training study found that more than 90% of prospective parents who practiced with a simple e-learning program and a mannequin could demonstrate correct infant positioning and chest compression technique. If you have a baby or young child at home, even a short training session significantly improves your readiness to respond.
Airway Clearance in Hospitals
In intensive care settings, patients on mechanical ventilators can’t cough effectively, and mucus accumulates in the artificial airway. Nurses and respiratory therapists perform endotracheal suctioning, passing a thin catheter through the breathing tube to vacuum out secretions. While necessary, the procedure isn’t benign. A prospective study of 270 suctioning events in mechanically ventilated newborns found that drops in oxygen saturation were the most frequent side effect, followed by changes in heart rate and breathing rate. Minor airway trauma and, rarely, pneumothorax were also documented. Because of these risks, current practice guidelines emphasize suctioning only when there’s a clinical indication, such as audible secretions or rising airway pressures, rather than on a fixed schedule.
For patients in the hospital but not on a ventilator, the same hierarchy of techniques applies as at home, just with professional guidance. Chest physiotherapy with postural drainage, breathing exercises, and sometimes bronchoscopy (where a flexible camera is threaded into the airways to directly suction mucus plugs or remove foreign bodies) are all part of the toolbox.
Choosing the Right Approach for Your Situation
The sheer number of airway clearance options can feel overwhelming, but matching the technique to the problem simplifies things considerably.
- Common cold or chest infection: Stay hydrated, drink warm fluids, and use huffing or controlled coughing to clear mucus as it loosens. Steam inhalation may help comfort-wise, though evidence for it improving clearance is thin.
- Chronic lung disease (COPD, bronchiectasis): An OPEP device used daily, combined with ACBT or huffing, is a practical starting regimen. Nebulized hypertonic saline before a clearance session may improve yield. Talk to your doctor about whether a mucolytic medication would help.
- Cystic fibrosis: Most people with CF use a combination of nebulized treatments (dornase alfa, hypertonic saline, bronchodilators) followed by a structured clearance session using ACBT, an oscillating device, or a chest wall oscillation vest. The sequence and timing matter; respiratory therapists customize these plans.
- Neuromuscular weakness: When cough muscles can’t generate enough force, mechanical insufflation-exsufflation is the primary tool, often combined with manual assisted coughing. Breath stacking before the assisted cough can improve peak flow.
- Choking emergency: Back blows and abdominal thrusts for conscious adults. Back blows and chest thrusts for infants. CPR if the person becomes unconscious. Call emergency services immediately.
One consistent finding across the research is that no single clearance technique is dramatically superior to the others for mucus conditions. The Cochrane review of ACBT, the comparisons between huffing and coughing, and the OPEP meta-analysis all point toward roughly equivalent outcomes among the standard approaches. What matters more than which technique you choose is doing it regularly and doing it correctly. A respiratory physiotherapist can teach you the right method for your condition, fine-tune your positioning and breathing pattern, and adjust the plan as your needs change over time.