Pulmonary Edema | Symptoms, Causes and Treatment

5. Aspiration

Choking occurs when a foreign material enters the airway, and further damage is normally prevented by coughing the offending substance out of the airways. In patients under anesthesia or with neurological disease, where the cough reflex is suppressed, there is a risk of gastric juice accidentally getting into the lungs. The strong acidity damages the lung tissue and allows fluid to enter.