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. The term “fluid in the lungs” is also used to refer to mucus inside the lungs. Mucus or phlegm is a thick, sticky secretion while “lung water” is a thin fluid. Other fluid accumulation may be the result of  blood or pus.

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