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Fluid in the lungs is a broad term to describe two possible conditions that may give characteristic symptoms, like a bubbling sound in the lungs (rales) when breathing. The fluid accumulation may be inside the lung (pulmonary edema) or outside the lung (pleural effusion), in the space between the lung and chest wall.
Pleural effusion occurs when too much fluid collects in the pleural space (the space between the two layers of the pleura). It is commonly known as water on the lungs.. It is characterized by shortness of breath, chest pain, gastric discomfort (dyspepsia), and cough.hen either too much fluid forms or something prevents its removal, the result is an excess of pleural fluidâan effusion. The most common causes are disease of the heart or lungs, and inflammation or infection of the pleura. Pleural effusion itself is not a disease as much as a result of many different diseases.