Sputum is not merely an unpleasant secretion. Left in place it can narrow the airways, reduce ventilation of parts of the lung and provide favourable ground for infection.
In healthy airways, mucus is produced continuously and carried upward by the movement of tiny cilia, then swallowed without our noticing. In bronchiectasis, cystic fibrosis, chronic bronchitis, after infections and in some neurological conditions, that system breaks down: secretions increase, thicken, or the cough force needed to move them is no longer sufficient.
At that point the answer is not “cough more”. A weak, repeated cough tires the person, irritates the airways and often fails to move the secretion at all. Airway clearance techniques aim first to loosen secretions, then to move them from the small airways to the large ones, and finally to clear them with a single effective effort.
Active Cycle of Breathing Technique (ACBT)
A technique with three components repeated in a set order, requiring no device:
- Breathing control: relaxed shoulders, normal depth, calm breathing. It acts as the rest phase between the other components.
- Thoracic expansion exercises: deep breaths in, with a short hold where appropriate, aiming to get air behind the secretions.
- Forced expiration technique (huffing): breathing out with an open mouth as if misting a window. It is less tiring than coughing and irritates the airways less.
How often and in what order the cycle is repeated is set individually.
Autogenic drainage
A technique that moves secretions upward in stages by breathing in a controlled way at different lung volumes. It starts at low volume and increases as secretions move towards the larger airways. It takes longer to learn than the other techniques, but once mastered it can be carried out independently without a device.
PEP and oscillating PEP devices
Positive expiratory pressure (PEP) devices allow you to breathe out against a light resistance. That resistance may help keep the airways open during exhalation and allow air to get behind the secretions. Oscillating models add vibration, which may help loosen thick secretions.
Device choice, resistance setting, duration and cleaning protocol are decided individually. The same device is not suitable for everyone, and in some conditions it is not recommended at all.
Effective cough and cough support
A cough has three phases: a deep breath in, building pressure as the glottis closes, and a sudden release. If any phase is weak, the cough is ineffective. This is common in neurological conditions and after abdominal surgery.
Support may include breath stacking techniques, manual support to the abdomen (particularly supporting the wound after surgery) and, in selected people, mechanical cough assist devices. Which is appropriate is determined by assessment.
The information on this page is for general guidance and does not replace individual advice. A physiotherapist does not diagnose; they assess and plan a programme within the framework of medical referral. Which techniques are suitable for you is determined through a face-to-face respiratory assessment. Please consult your doctor and physiotherapist before starting.
Sudden or rapidly worsening breathlessness, chest pain, bluish discolouration of the lips or nails, or confusion may signal an emergency. Do not attempt exercises in such a situation; call the emergency number (112 in Türkiye) or go to the nearest emergency department without delay.
Frequently Asked Questions
Classical percussion and postural drainage still have a place in some situations, but active techniques using the person's own breathing, and PEP devices, are more commonly preferred today. The choice depends on diagnosis, age and the nature of the secretions.
Swallowed secretions meet stomach acid and this is generally not a problem. The real issue is secretions accumulating in the airways. In children, coughing up and spitting out is often not possible anyway, so swallowing is the usual course.
If the sputum darkens, increases markedly in volume, appears bloodstained, or if you develop fever or worsening breathlessness, see your doctor before continuing the physiotherapy programme. These findings require medical assessment.