The reasons for pulmonary edema vary widely. The body is intricately connected, so when an event impacts one area of the body, other parts respond. The alveoli flood for one of two reasons. Either there is not enough oxygen in the bloodstream, or the body cannot get rid of enough carbon dioxide. Some possible causes include those that impact the lungs directly, like pneumonia, trauma, inflammation or near-drowning. Other causes originate in other parts of the body: organ failure, sepsis, or brain injuries. Finally, external causes include exposure to certain chemicals, reaction to medication, drug overdose and even high altitude.
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