7. Airway obstruction
During the normal process of breathing, negative pressure is generated in the lungs to suck the air in. This pressure should not exceed a particular range. When something blocks the airways, such as a piece of food or a coin, the lungs respond by putting in more effort to inhale air, resulting in increased negative pressure. Eventually, the air sacs and their thin membranes cannot stay intact and become ruptured and flooded.