Postural drainage is a technique that uses gravity to help move mucus out of your lungs. By positioning your body so that specific areas of the lungs are angled downward, thick or trapped mucus flows toward your larger airways, where you can cough it up more easily. It’s one of the oldest and most widely used forms of chest physical therapy, and it remains a core treatment for people with chronic lung conditions that produce excess mucus.
How Postural Drainage Works
Your lungs have five lobes, each with smaller segments that branch into increasingly tiny airways. When mucus builds up in these smaller passages, normal coughing sometimes can’t reach it. Postural drainage solves this by letting gravity do the heavy lifting. You hold specific body positions, each targeting a different lobe or segment, so that mucus drains “downhill” into the larger central airways called the bronchi. Once it reaches those larger passages, a deep cough or gentle huff is usually enough to clear it.
The technique is often combined with percussion (rhythmic clapping on the chest wall with cupped hands) or vibration (gentle shaking applied during exhalation). These additions help loosen mucus that’s stuck to airway walls, making it easier for gravity to pull it along. Together, the combination is sometimes called chest physical therapy or chest physiotherapy.
Who Benefits From It
Postural drainage is most commonly used by people with conditions that cause chronic mucus production or impaired mucus clearance. Cystic fibrosis is the classic example: the disease creates abnormally thick, sticky mucus that clogs the airways and breeds infections. Bronchiectasis, a condition where damaged airways widen and trap mucus, is another frequent indication. People with chronic obstructive pulmonary disease (COPD), chronic bronchitis, or lung infections like pneumonia may also benefit when mucus is difficult to clear on its own.
It’s not limited to chronic conditions. Postural drainage can help after surgery if anesthesia and bed rest have allowed secretions to pool in the lungs, or during a severe respiratory infection when congestion is overwhelming your body’s normal clearing mechanisms.
The Positions for Each Lung Area
Each drainage position targets a specific section of the lungs. You don’t need to use every position in a single session. Typically, a respiratory therapist or physician identifies which areas of your lungs are most affected and prescribes the positions that match.
Upper Lobes
For the upper portions of your lungs, you generally sit upright or lean slightly forward, sometimes at a 30-degree angle. These positions let the upper segments drain downward without requiring you to tilt your whole body. Different angles target the front, back, and side segments of the upper lobes.
Middle Lobe and Lingula
The middle lobe (right lung) and lingula (left lung) sit roughly in the center of your chest. To drain these areas, you lie on your back or slightly turned to one side with the foot of the bed or table elevated about 14 inches, creating roughly a 15-degree angle. A pillow placed behind you from shoulder to hip can add comfort and help hold the right position.
Lower Lobes
The lower lobes require the steepest angles. For most lower lobe segments, the foot of the drainage surface is elevated about 18 inches, creating a 30-degree tilt so your hips are significantly higher than your head. Different lower lobe segments call for lying face down, on your back, or on your side at this angle. For the superior segments of the lower lobes (the topmost part of the lower lobes), you lie flat on your stomach with two pillows under your hips instead of tilting the whole surface.
Equipment You Can Use at Home
You don’t need expensive medical equipment. Many people use a stack of firm pillows, sofa cushions, or foam wedges to achieve the right angles. For steeper positions, some families place bundles of newspapers under pillows to build up height and firmness.
If you need a more reliable setup, adjustable tilt boards or drainage tables can be purchased from medical equipment stores. These are essentially padded boards that elevate at one end. You can also build a simple version by placing sturdy blocks under the foot of a flat board. For infants, a caregiver’s lap works well, with or without pillows, and cribs with adjustable mattress heights can be tilted to the needed angle. The key principle is that whatever you use, comfort shouldn’t come at the expense of the correct drainage angle.
Timing and Preparation
Sessions should happen either before meals or at least two hours after eating. Lying with your head below your hips on a full stomach increases the risk of acid reflux or nausea. If you use a bronchodilator inhaler, take it at least 15 minutes before starting. This gives the medication time to open your airways, which makes mucus clearance significantly more effective during the session.
A typical session involves holding each prescribed position for 5 to 15 minutes. Most people perform two to four sessions per day, though the frequency depends on how much mucus you’re producing. During acute infections or flare-ups, more frequent sessions may be helpful.
How Effective Is It
Postural drainage with percussion has been used for decades and remains effective, though it’s no longer the only option. A study of 24 hospitalized cystic fibrosis patients compared professionally administered postural drainage and percussion against two mechanical alternatives: a vibrating vest (high-frequency chest wall compression) and a device that delivers rapid bursts of air into the lungs. The mechanical options cleared comparable amounts of mucus. Dry sputum weights, which remove the variable of saliva contamination, showed no significant difference between the three techniques. Patients had no strong preference for one method over another.
The practical takeaway is that postural drainage works about as well as newer, device-based therapies. Its main advantage is that it requires no specialized equipment. Its main drawback is that some positions are physically uncomfortable, and percussion often requires a second person to help. For that reason, many people with chronic conditions try multiple airway clearance methods and settle on whichever they’ll actually do consistently.
Safety Considerations
Head-down positions increase pressure in the head, chest, and abdomen. This makes postural drainage unsuitable in certain situations. People with uncontrolled high blood pressure, recent head or neck surgery, active bleeding in the lungs, or severe heart failure should avoid steep Trendelenburg (head-down) positions. Rib fractures, spinal instability, and recent abdominal surgery are also reasons to skip or modify certain positions.
Even for people without these conditions, mild discomfort is normal when you first start. Brief dizziness when getting up from a head-down position is common. Moving slowly between positions and sitting upright for a moment before standing helps. If you experience significant shortness of breath, chest pain, or coughing up blood during a session, stop and contact your care team.