What causes a collapses lung?

Somewhere a hole.: Lung collapses because air leaks into the chest cavity through a hole in the lung or in the chest wall, or a fluid such as blood or serum leaks into the chest cavity and compresses the lung. In tall young healthy males this sometimes occurs spontaneously. Happens with obstructive lung disease and of course with trauma and severe lung disease or mechanical ventilation.

Defect in the lung: Though most of the time when a lung collapses, it is caused by some type of trauma, there are some patients that have defects in the lung surface. These illnesses range from emphysema to lung fibrosis. There are some genetic mutations that also have been associated with weakness in the surface of the lungs. If the collapse of the lung was unprovoked, your doctor may need to do some tests.