How to Clear Your Lungs After COVID

Clearing your lungs after COVID involves a combination of specific breathing techniques, physical movement, hydration, and sometimes structured rehabilitation, all aimed at loosening trapped mucus, reducing airway inflammation, and rebuilding the strength of your breathing muscles. There is no single trick that flushes everything out overnight. But the good news is that several methods have solid evidence behind them, and most can be done at home without special equipment. The approach that works best depends on whether your main problem is thick mucus you cannot seem to cough up, persistent breathlessness that lingers for months, or weak respiratory muscles that leave you winded after walking across a room.

Why Your Lungs Feel Clogged in the First Place

SARS-CoV-2 does something unusual to the airways. The virus triggers overproduction of mucins, the proteins that make mucus thick and sticky, by ramping up inflammatory signals and growth-factor pathways in the cells lining your bronchial tubes.¹ One hypothesis is that the virus hyperstimulates mucus-secreting goblet cells in the trachea, leading to a persistent feeling of something stuck in the airway and, in some people, a sense of suffocation.² This is not the same as a regular cold. The mucus can be thicker, stickier, and lodged deeper in the small airways where a normal cough cannot reach it easily.

On top of the mucus problem, COVID can leave behind lingering inflammation and, in some cases, subtle scarring in the lung tissue. That means even after the infection clears, your lungs may not expand as fully or exchange oxygen as efficiently as they used to. The combination of residual mucus, inflamed airways, and weakened breathing muscles is what makes the post-COVID chest feel so stubbornly heavy.

How Long Respiratory Symptoms Typically Last

If you are wondering whether what you are feeling is normal, you are not alone. A meta-analysis pooling data from 19 studies found that breathlessness affected about a quarter of people with long COVID and persisted for an average of roughly six and a half months.³ In a large multicenter study that followed patients about 11 months after hospital discharge, only about one in five were completely free of any respiratory symptom. Breathlessness was the most common lingering complaint, affecting roughly a quarter of participants, while persistent cough was less frequent at around 2.5%.⁴

A prospective cohort study tracking breathlessness over time found that about half of patients had clinically meaningful breathing difficulty at three months, and the proportion barely budged by 12 months. About a quarter of patients actually experienced worsening breathlessness between three and 12 months, while roughly a quarter improved.⁵ The takeaway: post-COVID breathing problems are common, can be slow to resolve on their own, and sometimes get worse rather than better. That is precisely why active strategies matter.

The Active Cycle of Breathing Technique

If you are going to learn one airway-clearance method, this is the one. The Active Cycle of Breathing Technique, or ACBT, is a sequence that physiotherapists have used for decades in people with chronic lung conditions, and it has strong evidence in the post-COVID population specifically. It alternates between three phases: relaxed breathing to keep your airways calm, deep breathing to get air behind trapped mucus, and a “huff” (a sharp exhale through an open mouth, like fogging a mirror) that moves secretions up without the violent force of a full cough.

A systematic review across chronic respiratory diseases found ACBT effective at increasing the amount of mucus coughed up and reducing how thick and sticky the secretions are, while also easing breathlessness.⁶ In a study directly comparing ACBT plus standard breathing exercises against breathing exercises alone in post-COVID patients, the group that used ACBT showed significantly better improvements in oxygen levels and lung function over a two-week period.⁷

A typical ACBT session takes about 10 to 15 minutes and can be done sitting upright or in different body positions (more on that below). The sequence usually goes: a minute or two of gentle, relaxed breathing; three or four deep breaths with a brief hold at the top; back to relaxed breathing; then two or three huffs followed by a cough if something has moved up. Repeat the cycle a few times per session, and aim for two to three sessions a day when you are actively trying to clear secretions.

Positioning Your Body to Help Gravity Do the Work

Mucus follows gravity. If secretions are pooled in a particular lobe of your lung, positioning yourself so that lobe is above the airway that drains it can help mucus slide toward your central airways where a huff or cough can expel it. This is the principle behind postural drainage, and it is commonly recommended alongside ACBT or other airway clearance methods for COVID recovery.⁸

For the lower lobes, which is where post-COVID mucus often accumulates, lying on your stomach with a pillow under your hips (so your chest tilts slightly downward) is a common position. For the upper lobes, sitting upright and leaning slightly forward works well. You hold the position for 10 to 20 minutes while performing breathing cycles. Patient positioning, along with proper hydration and sequencing, is a key determinant of how well these techniques work in practice.⁹

A word of caution: if you have acid reflux or feel dizzy when lying head-down, modified positions that are less steep can still help. And if you are very breathless at rest, lying flat on your stomach may feel uncomfortable at first. Start with gentle angles and work up.

Oscillating PEP Devices

You may have seen handheld devices marketed for lung clearance: small tubes or pipes you exhale into that create vibrations and back-pressure in your airways. These are oscillating positive expiratory pressure (OPEP) devices, and they work by combining two effects. The back-pressure helps keep small airways open so air can get behind mucus plugs, and the vibrations physically shake secretions loose from airway walls.¹⁰

Research in COPD patients has shown that these devices can decrease airway resistance and reduce the trapping of air in the lungs, even in people who do not have much mucus to clear.¹¹ Several brands are available over the counter. They are relatively inexpensive, portable, and easy to use. You breathe in normally, then exhale steadily through the device for several breaths, pausing to huff or cough when you feel mucus moving. Most manufacturers recommend 10 to 20 minutes per session.

These devices are not a magic fix, and they work best as part of a broader routine that includes breathing techniques and adequate hydration. But they are a reasonable option if you find it hard to clear mucus with breathing exercises alone, or if you want a tool that makes the process feel more structured.

Hydration and Steam

Thin mucus is easier to move than thick mucus. Staying well hydrated is one of the simplest and most overlooked steps in lung clearance. Drinking plenty of water helps dilute thick secretions so they can be coughed up more easily.¹² There is no specific daily water target backed by rigorous trials for this purpose; the practical advice is simply to drink enough that your urine stays a light straw color, and to increase intake if you notice your mucus becoming thicker.

Steam inhalation is a traditional remedy often recommended alongside hydration. Breathing in warm, moist air can soothe irritated airways and temporarily thin secretions, making it easier to clear them during a breathing exercise session. A practical approach is to lean over a bowl of hot water with a towel draped over your head, or to spend time in a steamy bathroom. That said, the clinical evidence for steam’s broader respiratory benefits is modest. A randomized trial in people with chronic sinus symptoms found that steam reduced headache but had no significant effect on other outcomes.¹³ Steam is probably best thought of as a comfort measure and a mucus-thinning aid rather than a treatment on its own. Use it before a breathing exercise session to soften secretions, not as a substitute for active clearance techniques.

Rebuilding Your Breathing Muscles

Clearing mucus is only half the battle. Many people recovering from COVID find that their breathing muscles, especially the diaphragm, have weakened. This shows up as breathlessness during activities that used to be easy: climbing stairs, carrying groceries, talking while walking. Targeted training can make a real difference.

A randomized controlled study in people with post-COVID symptoms after mild-to-moderate infections found that diaphragmatic strengthening exercises significantly improved breathlessness scores, oxygen levels, walking distance, and lung function, while a control group that received no exercise intervention showed no significant improvement.¹⁴ Another trial combined a manual diaphragm release technique with inspiratory muscle training and found that breathlessness dropped by nearly half in the treatment group, compared with a modest decrease in the control group.¹⁵

Inspiratory muscle training, which involves breathing in through a small resistance device that makes your breathing muscles work harder, has also been shown to significantly improve inspiratory muscle strength in post-COVID patients.¹⁶ A meta-analysis of randomized trials found that respiratory muscle training boosted inspiratory pressure by about 30 cmH₂O on average and improved walking distance by about 40 meters on a six-minute walk test.¹⁷ Forty meters might sound modest on paper, but for someone who gets winded walking to the mailbox, that gain translates into real daily function.

Pulmonary Rehabilitation Programs

If self-directed breathing exercises are not enough, formal pulmonary rehabilitation combines structured exercise with breathing retraining, education, and sometimes psychological support. A meta-analysis of randomized trials in long-COVID patients found that pulmonary rehabilitation improved physical capacity, lung function, and quality of life while reducing breathlessness, fatigue, and anxiety. The analysis suggested that programs lasting four to eight weeks and combining breathing exercises with broader physical training were most effective.¹⁸

Pulmonary rehab is typically offered through hospital outpatient departments or specialized clinics. Programs usually involve supervised sessions two or three times a week, with a home exercise component on the off days. If you have been breathless for months and self-management has plateaued, asking your doctor for a referral is worthwhile. These programs were designed long before COVID for people with COPD and pulmonary fibrosis; the infrastructure already exists in most health systems.

When Breathlessness Is Not About Mucus

Here is something that catches many people off guard: not all post-COVID breathing difficulty comes from clogged airways. Some patients have breathlessness that is out of proportion to any measurable change in their lung function. Their chest X-rays look fine, their spirometry results are near normal, yet they feel like they cannot get a full breath. In some of these cases, the issue is dysfunctional breathing, a pattern of irregular and variable breathing rates or volumes that disrupts normal gas exchange.¹⁹

Serious complications like blood clots in the lungs, interstitial lung disease, and heart failure also need to be ruled out, because these require entirely different treatments.²⁰ If your breathlessness is worsening rather than improving, comes with chest pain or leg swelling, or appeared suddenly weeks after your acute infection, see a doctor promptly. Lung function testing can help distinguish between a restrictive pattern (the lungs cannot expand fully), an obstructive pattern (air cannot flow out properly), and problems with gas exchange across the lung membrane.²¹ Knowing which pattern you have guides the right treatment approach.

Autogenic Drainage for Stubborn Deep Secretions

If ACBT is not moving secretions from deep in your lungs, autogenic drainage is a more advanced technique worth knowing about. It involves breathing at different lung volumes to target mucus in different-sized airways. You start by exhaling gently at low lung volumes to unstick mucus from the smallest, deepest airways, then gradually breathe at higher volumes to collect and move that mucus toward the larger airways where it can be huffed or coughed out. The exhale is active but gentle, aiming for the highest possible airflow without triggering airway collapse or spasm.²²

Autogenic drainage takes practice to learn properly, and most people benefit from a session or two with a respiratory physiotherapist to get the hang of it. But once learned, it can be done independently and does not require any equipment. It tends to be quieter and less physically demanding than ACBT, which makes it a good option for people who find vigorous huffing uncomfortable or exhausting.

The Post-Exertional Malaise Problem

One complication that makes post-COVID lung clearance trickier than, say, recovering from pneumonia is that a subset of long-COVID patients experience post-exertional malaise: a crash in energy and a flare-up of symptoms after physical or mental exertion. If you push through a breathing exercise session or a walk and feel dramatically worse the next day, this could be what is happening. Evidence from the chronic fatigue syndrome literature, which overlaps with long COVID in important ways, supports individualizing exercise programs and being cautious about prescribing activity levels that trigger these crashes.²³

This does not mean you should avoid all activity. It means you should pay close attention to how you feel 24 to 48 hours after a session, not just during it. If a 15-minute breathing routine leaves you exhausted the next day, scale back to five minutes and build up slowly. The goal is to find a level of effort that helps clear your lungs and build strength without triggering a setback. Pacing is not laziness; it is strategy.

Environmental Factors That Slow Recovery

Where you live and what you breathe matters more than most people realize during lung recovery. A cohort study in Saudi Arabia found that elevated fine particulate matter (PM2.5) in residential areas was strongly associated with persistent COVID symptoms, and people living near high-traffic areas had a roughly 45% higher risk of long-term symptoms. Having pre-existing health conditions amplified the risk by about 55%.²⁴

While you obviously cannot move to a new city for cleaner air, there are practical steps that help. Running a HEPA air purifier in the room where you sleep and do your breathing exercises reduces your particulate exposure during the hours when your lungs are working hardest to recover. Avoiding wood smoke, vaping, and secondhand cigarette smoke is critical. If you live near a busy road, keeping windows closed during peak traffic hours and relying on filtered ventilation can reduce indoor pollution. These adjustments will not clear your lungs on their own, but they remove obstacles that make every other intervention work a little less well.

What the Gut Microbiome Might Have to Do With It

An emerging and still-preliminary area of research connects the bacteria in your gut and respiratory tract to how well your lungs recover after severe COVID. A study tracking microbiota dynamics in recovering patients found that bacterial diversity in the upper respiratory tract increased during recovery, while gut microbial diversity remained stable. The respiratory and gut microbiomes appeared to follow distinct recovery trajectories.²⁵ This is a preprint, not yet peer-reviewed, so the findings should be taken cautiously. But the so-called gut-lung axis is an active area of investigation, and there is broad interest in whether probiotics or dietary changes that support microbial diversity might aid lung recovery. No specific supplement or probiotic regimen has enough clinical evidence yet to recommend confidently for post-COVID lung clearing. For now, a varied diet rich in fiber and fermented foods is a reasonable default that supports overall microbial health without risk of harm.