A number of things: When fluid accumulates in the spaces around the lungs (pleural spaces), this is called a pleural effusion. There are a number of causes for pleural effusions. One cause is heart failure. When the heart does not work well, its pumping action is decreased and fluid can back up into the lungs and the spaces around the lungs. Another cause might be inflammation of the lungs (as with pneumonia).
Answered 11/10/2019
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