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The lungs are surrounded by the pleural cavity, a lining of two lubricated layers that allows the negative pressure of breathing to be maintained without friction. The negative inspiratory force in the chest is due to the action of the diaphragm, a muscle below the lungs which separates the chest from the abdomen.
Pneumothorax is a condition in which air or gas collects in the pleural space or pleural cavity, which is the space between the lungs and the chest cavity. This can cause the lung to collapse. Normally, the lungs sit next to the inner surface of the chest wall. Thin membranes called pleura cover both the lungs and the chest wall. A pneumothorax occurs when air either escapes the lung or leaks in through the chest wall and builds up in the pleural space between them. This build-up of air can result in the collapse of the affected lung. There are different types of pneumothorax, and each one is defined by its cause.